Hi Pleoniotes,
we can refer 2 deaths . Physical and Spiritual . A person is spiritually dead when he follows the world i.e anything immoral, sexual impurity or anything which hurts others . Even though that person is physically living in this world but actually he is dead in spirit and when he leaves the world when his time comes, he will never be with God or atleast cant stand infront of God . If this same person before physically dead somehow repent i.e changed his heart from the sin and comes towards God and come out of every filth, Jesus will cleanse his sin and when he leaves this world , its definite that he will be with God .
If someone does wrong, you can always say a word personally to him in which he can understand or you can pray for him . Our God can provide you with much wisdom and power that you can overcome any bullying or anything . Just pray .
When comes to sexual impurity . Bio logical attraction and lust are different . When time comes, you will have your partner waiting for you and i dont know anything of your circumstances . I give this advise to porn addicts ,to just think for a second if they can imagine their mom or sister or daughter in that porn video and if they can able to watch it . If they are able to watch it, then definetely they would need God to make them understand its wrong but if anyone thinks its wrong, i would like him to write atleast 5 answers why its wrong and you will find more answers by yourselves .
I dont know if any of this will help you . All i can say is to trust God and pray and he will pull you out
Naveen