Hi, I'm new here and I needing some help desperately.
I have been in a relationship for nearly 2 years now and I spend most of the time happy, some of the time sad and the rest of the time arguing.
I'm 25 and my partner is 26 and before we had met we had let very different lives. Id only had one sexual partner and I was with her for 6 years, her on the other hand had 8 and longest relationship was 1 year.
I don't understand a lot of things that she's told me and this hurts me a lot and I want to get rid of it so that I can move on and marry her and be happy.
The guy of a year a don't really mind because it was a year and was a proper relationship but the others are different. The main problem is a guy that she was pals with, no attraction whatsoever but after being out one night they went back to his house (as friends) had drinks with other friends and she decided to stay there instead of taxi-ing home. She decided she could sleep in bed next to him with her clothes on and after a bit in bed he kissed her and they had sex, never talking again. Now why would you do this? If you don't like him them kissing him should be bad enough never mind doing this. Another guy she had known and they text each other and something must have been said about him wanting to have sex with her so she met up in his car 3 time just for sex, in my eyes she should have been charging him for that because its wrong in so many levels.
She didn't mind sharing things like this with me but it eats up at me so bad its crazy. I seem to throw it back at her and try and hurt her the way I'm hurting and its not good for our relationship at all. I have never cried so much in my life than meeting her and finding out that she has this horrible side to her :(. Yeah you may think I'm childish and all this but unless you think like me or have been in this position its hard to understand. I'm not here for abuse I'm here for a proper solution to this because I can't be the only one in the world that has been like this. Please help me past this and stop me destroying everything

Obviously you cannot accept your morals are so different, and until you do, you really don't need to be with her, until you resolve this issue within yourself, and make peace with it. I say leave her alone, as why should she suffer for your inability to handle the truth about her, and be accepted, as she was honest enough to tell you.
If you cannot put a lid on the abuse you throw at her, get the freak away from her.

While her behavior is unacceptable to you, yours is unacceptable to her, but these are your issues to deal with, not hers so have the courtesy to be mature and positive about how you cope wit this, or be honest yourself as she has and leave.

THINK BEFORE YOU ACT OR SPEAK, ESPECIALLY WHEN YOUR ANGRY, as you learn to cope with your own feelings better.

Tal is right. If you can't accept her, you need to move on.

She may have done things that you don't approve of, but she's been honest and up-front with you about everything and doesn't deserve having you throw it in her face continually.

Move on and find a girl with a clean past who has the same standards as you.