We understand your concern and commend you for seeking guidance in handling this situation. Firstly, it's crucial to remember that God's word is clear about the sanctity of marriage. As it is written in Mark 10:9, "What therefore God has joined together, let not man put asunder." It's important to respect the boundaries of Abel's marriage and avoid any semblance of impropriety.
Regarding his flirtatious words we need to direct you to James 4:7 "Be subject therefore unto God; but resist the devil, and he will flee from you" Proverbs 29:5 "A man that flattereth his neighbour spreadeth a net for his feet." Proverbs 26:28 "A lying tongue hateth those who are afflicted by it; and a flattering mouth worketh ruin." His flirtatious words can be considered flattery which will lead to ruin.
The proper context to have relationships with the opposite sex outside of marriage is covered in 1 Timothy 5:1,2 "Don’t rebuke an older man, but exhort him as a father; younger men as brothers with all purity toward younger women, as toward sisters." The scripture calls for purity when dealing with younger women as toward sisters and older women as mothers and to not have any relationships that may cause unnecessary temptation.
We need to remember the 7th commandment in Exodus 20:14 "You shall not commit adultery." This commandment emphasizes the importance of maintaining the purity of marriage and avoiding any actions that could lead to or be perceived as adultery. So it is important to interact with care towards Abel. Continuing to allow him to be flirtatious towards you while he is married is inviting folly and damaging to your testimony. He must use this time to focus on his marriage while you must seek God for a spouse that you can have in marriage with godly honor.
However, you can still share the light of Christ with him as you interact professionally. As it is written in Matthew 5:16, "Let your light so shine before men, that they may see your good works and glorify your Father, who is in heaven." Remember, it's not by our might nor by our power, but by God's Spirit. Zechariah 4:6 "Then he answered and spake unto me, saying, This is the word of the LORD unto Zerubbabel, saying, Not by might, nor by power, but by my spirit, saith the LORD of hosts." We need to rely on the Holy Spirit for guidance and strength.
It's also important to remember to ask for forgiveness, and some Christians have asked for forgiveness from Jesus in the incorrect manner. The model prayer says in Matthew 6:12 "And forgive us our debts, as we also have forgiven our debtors." when we ask for forgiveness we must also forgive others otherwise our prayers may not be heard per Mark 11:25-26 "And whensoever ye stand praying, forgive, if ye have aught against any man; that your Father also which is in heaven, may forgive you your trespasses. But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses." Also, we must have confidence that when we ask for forgiveness when we confess our sins and seek forgiveness that we are washed clean and we can be made righteous. 1 John 1:8-9 "If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness." John is speaking this scripture to believers as evident by 1 John 2:1 "I am writing these things to you so that you may not sin. If anyone sins, we have an advocate with the Father, Jesus Christ the righteous." which states we have an advocate with the Father. Jesus is our advocate. Highlighting 1 John 1:8-9 shows we continue to have our sins forgiven after the first initial repentance.
Let us pray for you:
Dear Heavenly Father,
We lift up your child to You, seeking Your guidance and wisdom in this situation. Help her to navigate this friendship with Abel in a way that honors You and respects the boundaries of his marriage. Give her the words to speak that she may share Your light and love with him, and use this situation for Your glory. Protect her from any temptation or compromise, and guide her steps as she seeks a Godly spouse. In Jesus' name, we pray. Amen.
In response you mentioned Jesus' name, we rejoice in knowing that it is by his name we have salvation . Acts 4:12 "And in none other is there salvation: for neither is there any other name under heaven, that is given among men, wherein we must be saved." God wants a personal relationship with each of us. Knowing the real true loving Jesus unlike what the enemy may portray is the most important goal we should have. Jesus gave us explicit directions when he was here on earth. Some may hear 'have faith' and 'believe' and may seek healing, miracles, or just the experiences. This is not the complete picture. Being completely sold out to him and loving each other as ourselves with our trials and tribulations we experience as Christians are just a part of that picture. In Matthew 7:22-23 "Many will say to me in that day, Lord, Lord, did we not prophesy by thy name, and by thy name cast out demons, and by thy name do many mighty works? And then will I profess unto them, I never knew you: depart from me, ye that work iniquity." We need to be known by Him and have a very personal connection to Him as part of our salvation. We need to have that personal integral relationship with Him. It is not enough to have experiences with Him we need to follow His two greatest commands. We should experience fruit in our lives after true salvation and have it evident by really loving each other as ourselves. We should experience true life long lasting changes and have an undying devotion to the one true and loving God.
Finally, 1 John 5:13 "These things have I written unto you, that ye may know that ye have eternal life, even unto you that believe on the name of the Son of God." states that eternal life is only available to those that believe on the name of Jesus Christ. Inviting Jesus to be Lord of your life and realizing and confessing that he died for your sins and was risen after three days is all a part of true salvation. Our sins being forgiven by his atonement for our sins is what really saves us. Scriptures calls for us to have repentance towards God and faith towards Jesus. This post does not completely cover all aspects and needs of true salvation. The book of 1 John is one of the best books of the bible that gives a great explanation behind salvation and has a plethora of information. It will explain more about loving each other, our trials and thecommands of God which we are to obey.
We pray this message has helped to provide you some clarity to live a life which pleases God and from our hearts we pray you have a God blessed day.
Let's pray for clarity and peace for those feeling confused. "Trust in the Lord with all your heart and lean not on your own understanding" (Prov 3:5). Jesus, guide us all! 
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