This is a new account just because I want to be able to go into detail and I have family and friends who know my main one.

Long story short: I've been a Christian of faith all my life but during my 20s I couldn't get a Girlfriend to save my life, so I started learning how to "pick up chicks" from those dating gurus and became quite good at it. So that lead me into a path of sexual promiscuity. This went on for 6 years.

I was sleeping with a different girl every other week while still praying and going to church but I justified it as "when I was in church and doing my part, I was lonely and no girl in church wanted me, so now that girls finally want me, let me be happy. If God wanted to give me a nice Christian girl He would"

Fast forward to 6 months ago. I meet a girl that I fall for and she started check mating my faith because I never been ashamed of it. She said "well you have sex before marriage, your Bible says that's a sin and that you won't get into heaven". Believe it or not I just stayed quiet and during the week she said that... I really began to feel uncomfortable.

I changed a lot about my life with help of the Holy Spirit. I decided I never wanted to be on dating apps or date non Christian women ever again. I repented from my sins and asked God to cleanse my spirit and give me strength to resist the temptations. God is working very amazingly in my life but... I was still having relations with my girlfriend. Last week she came over and asked if something was wrong. We had a long talk about my faith, modern culture, the world, and she agrees, and she believes that God exists, just not that Jesus is a savior.

I do love her and intend on marrying her but I'm sure if I tell her I don't want to have sex with her anymore, that she will feel insulted or assume I'm cheating or something. How do I approach this? I don't want to lose her but I don't want to mock God when he's giving me a second chance..