Well, I've been dating this girl for four years, she's 18 now and I'm 20. We had a son on July 4th 2007 and our relationship isn't going so well.
I lost my job while we were living together and then she got one while I watched our son.
First day she gets off the job training she tells me about all these guys trying to get at her and I know they are cause she is really good looking. She comes home late and then we got into a argument, I left to cool off and then had to walk home at 2:30am.
She worked 3:30pm to 11:30pm, that next day she came home at 4 in the morning and tried getting on me and trying to make love... I was pissed. I found out later from her that she was at this dudes house that's now her boyfriend I guess. She told me she was all on top of him and stuff. Now I was mad and we were about to get evicted so I told I wanted to go back to my moms, she got up and left.
I didn't talk to her for about a week and her new boyfriend that already has a wife and 2 kids is with her.
I been going over to her house and being the nicest I can and all she does is talk mess, talk about this and that, and how she slept with her boyfriend, but she tries getting me all excited you know.
I love her so much and I don't know what to do, I know I made a mistake but she doesn't seem to want to work it out. Its like I'm nothing to her, and I did so much for her in these past years... the pain is so bad I feel like crying every night cause she'll leave me and act a fool..
Need help.. Scott

Let her leave you and act a fool. If she is that shallow that she can go from you to another guy and then expect to come back to you as though nothing happened then you deserve better. When she tries to get on with you visualize in your mind the fact that she is with this other guy so you don't give in. You need to stand your ground and not come off as needy and wanting her back. If you want her back wait until she realizes what a mistake she made.
Otherwise she is just going to keep pulling this kind of stuff on you as long as you let her.

It sounds like you should move on if you are really that good of a guy she will see this and come back just back off for awhile but don't forget the most important person in the long run your son he really does need you more then you will ever know. Take it from me I don't listen to my friends and family and I should I have a son and all his dad does is hurt me and put me down but I keep running back and it just depresses me and makes me crazy I guess you can say but when I'm with my friends and family I am a totally different person. Just try chilling with your friends or with your son it will help not to think about her as much as possible. :)

You have no choice, but let her go, and put your focus on the well being of the child you both created. You are tied together for a lot of years, because of this, so stop worrying about her, and be a great dad! Whatever it takes, man up, and do the right thing, and put your priorities in order.

Sounds like she has issues she needs to work out. Try to move on with your life because it sounds like she did while the two of you were together. Worry about your child and try to let her go for now.