Okay..me and my girl has been dating over 8 months now...shes 17..18 next month..and im 18..19 in 2 months. I know how crazy the world has gotten and how most girls have turned. I'm one who wants to be mature about a relationship and want to be committed, and i really want that in her. She's a Christian girl..doesn't do anything bad (as far as I know and trust of her). But for some reason I still don't trust her fully. I don't understand why this is, given that shes never done anything wrong that would make me worry that she's cheating or something like that. I've read that maybe it's because of my past experiences with girls that have betrayed me. Every time my girlfriend hangs out with a friend or something..I question her over and over asking "What all did you do?" and "You didn't act wild or do anything bad did you". When i do this, it really stresses her out and it causes arguments..everytime. But I just cant help but ask because I just worry about what she's doing so much. And also when we do sexual things..I always get on my mind that it might turn her bad because she seems to enjoy it a great amount and i jus start worrying that she'd wanna start doing it in general with others...ive even asked her about that and she's swore to God, swore on the bible, swore on my life..that'd she'd never do such a thing to me and that I'm her "one and only". We've talked about her past...she's only dated one other guy..but she claims that didn't work out because she found out he was a "partier". And what kinda gets me is that she told me back about her Freshman year..when she was like 15 or so..she used to go to her friends house where she had an older brother..and she said she had kissed this guy like 3 or 4 times that she went to her friends house..and they weren't dating or anything. She tells me that she and her friends brother we're pretty close so that's why she felt like it wasn't wrong..and she also tells me its because she thought it would be "cool to kiss an older guy"..that just kinda makes me confused. Is there any advice about all of this case?