Problems with my GF and her past not going away

Okay here goes...I know stories similar to this have been posted and gone over just about to death on this website, but no two stories are exactly the same..

I LOVE my girlfriend to DEATH. I have never felt this way about a girl before, even the 3 year relationship that left me devastated for 7 months before I met my current girlfriend.

I had never met my current girlfriend until 5 months ago when we first started dating even though she only lives 6 miles away from me. There is a 3.5 year age difference between us.

Now, she has slept with 6 guys before me. I know every one of these guys personally, even though I've never met her before. 3 of the guys were actually in my class. My girlfriend also has a history of drug abuse from the time she was 12 to the time she turned 16, which she quit the drug abuse 4 months before I met her.

The thing that bothers me the MOST is the one guy she slept with. This guy is in my class and I have hated him for years now. I hate him because one of my previous girlfriends, more than 4 years ago, had left me for him, and I really cared for her a lot. My current girlfriend has been friends with this guy for more than 2 years, BEST FRIENDS. They did drugs together and hung out 24/7 but never had a relationships and never had sex...until I met her. 2 weeks after I met her, she slept with him. Never before she did anything with him, not in the 2 years they were friends, she just did it right after she started talking to me. Now, we weren't dating yet, we didn't start officially dating until a week or two after she slept with him but she did lie to me about it before we started dating. I found out the truth a few weeks later after we started dating.

Now...the worst part is is that this guy who I hate more than anyone, is her brothers best friend. I see him EVERY DAY at her house. He's not there for her, I DO believe that. They are not friends any more, they don't talk. But I can't stand him being there, by her, every single day.

Also, to add to the problem, I find out she was talking to him still 2 months into our relationship, just telling him how she missed how it used to be, how close they were and how good of friends they were.

Now, this guy has been friends with her for a long time and she slept with him. This is not the only long time guy friend that she has slept with. One other of her guy friends, also my age, she had slept with numerous times, and in fact had her first and only experience with ecstasy with this guy and stayed up having sex with him in her aunts van, while high on ecstasy. He comes over every once in awhile to see her and her family, but I am always there. That guy, I too have grown up with. I have known him for YEARS. But he doesn't bother me as much as the other guy...

The other people she has had sex with include her first boyfriend, whom she would get high with all day every day, who she had sex with 7 times in one day (just because he had begged her to) who LIVED with her, yes lived with his 15 year old girlfriend at the time, and also another guy who she kind of liked but not really, who she had sex with because she was drunk and high at the same time.

I honestly believe that she hasn't cheated on me. I know she doesn't do drugs any more, I KNOW she quit. I know she has straightened herself out, I have no questions about that. I know she loves me more than she's loved anybody before.

We have been fighting constantly about the one guy she slept with, the guy I hate. The guy who took my first love from me, and then comes back to have sex with the girl I am ready to spend the rest of my life with, DAYS BEFORE I START DATING HER!

Lately when I argue about it, she just starts crying and asks my why I can't let it go...she cries all the time now when I say anything about it...she never used to cry about anything...

I just can't help it, even though she ignores him when he's at her house, I still can't let it go. He's there and it really bothers me...

She just wants me to get a place of my own so we can move out and don't have to deal with it any more, she just wants everything in her past to go away.

Please help me out, I love this girl more than anything and I have no doubt that she wants to be with me for the rest of her life.