I am a young guy in my thirties and have fornicated for years until I met a woman I cherish with my life. We have agreed to marry. Then she told me she can't go out with me again. It is impossible for me to even eat. I just told God that I have stop everything and will worship Him faithfully. I want to ask: Will God forgive my sins and purify me also?
Thank you, sir.
"Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. And such were some of you. But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus and by the Spirit of our God" (I Corinthians 6:9-11).
When a person turns from his sins and comes to God as God directs, then all sins are washed away. See What Must I Do to be Saved?
This won't bring your girlfriend back, but it will save your life. Perhaps she'll like the new you, but even if she doesn't be a follower of Christ because that is the best thing that you can do for yourself.