Finding Out Depressed

What should I do if my girlfriend cheated on me with my roommate and then left me? I love her very much!!?
So the story goes: my girlfriend and I had this amazing relationship or so I thought, but she has been the only person I have ever met who actually made me happy and really showed she cared. or so i thought again. We started to have some disagreements mostly due to my stupidity, such as I was wicked sick with this cough from hell for a month. I started to take NyQuil for it and took too much. then some other cough meds like 3 days in a row so i would stop coughing. Needless to say i screwed up and got high like 3 days in a row without even realizing it. She was furious with me for not paying attention and getting stoned. She didnt like it and it scared her. So then there was another night I found out some very depressing things about my oldest son, and had just one drink. I told her roommate the next day before i talked to her (her roommate called me first) that i strangely got a buzz the night before. ( i had not eaten anything that day and had a fairly strong drink) When I called my girlfriend, she asked me what i did that night to see if i would tell her. obviously i told her i had a drink with my roommates and watched some tv she was mad at me for drinking after finding out depressing info. So back to the whole cheating thing. As you may see, she uses anger to express fear or sorrow. I knew that her and my roommate were getting close, but they just seemed to be no more than friends. I found out about 3 weeks ago that she actually had a small crush on him when they first me but it was over. I found out from her roommates boyfriend who happens to be my roommate, well her roommate is a very dramatic person. So it seemed much worse than it really was or so i thought. So last saturday, i went to see my kids at my mothers house and she stayed at my house and supposedly went to see her roommates daughter. My roommates all went where ever, accept the one who she cheated on me with. he went to the "skate park". By the way the girls stay over on the weekends. every sunday my other roommate and i bring our girlfriends home. well this sunday they supposedly went to her roommates aunts house to do laundry then i was told that her roommates aunt was going to bring them home and that i had to stay home while my other roommate went to see his daughter. (very screwed up stuff) I said ok thats cool. The next day I found out from her aunt that they in fact never went to the aunts house and that she did not want me to go with her to drop her off. I confronted her on it and started to obviously get paranoid as to what she was really doing, not to mention, that whole weekend, she completely ignored me. I knew something was up and it seemed that everybody in the house was lying to me or hiding something. well today has been a week and a day that she broke up with me and i just found out that she was sleeping with my roommate. I have always known and just never found a way to catch them. When she broke up with me, she was very harsh and beat around it for a while. then when i got sick of hiding from the enevitable i told her she was really bad at braking up with people. i asked her if she was trying to get me to leave her she said no but then she left me. When i asked her why beside the fact that we had been fighting a bit due to her secrecy and she felt i was invading her space. she also told me i was a liar and that i still loved my ex girlfriend who is the mother of my children. i have a restraining order on her and have no spoken to her since the day i got it. Back to the situation, so my girlfriend the rest of the night of braking up with me had been telling me all kinds of unkind things. She was mad that I caught them in a lie and they would not tell me the truth anyway. last night, my ex sent her a friends request on myspace and she accepted it. and they started talking. Now i have the person i hate and the person i love attacking me, and i am floored as to why. Today I learned from my homewrecking roommates ex that my gf had been sleeping with him. I knew about it as i said well i had a very good suspicion. and it was obviously confirmed. when i came out of my room, as i went outside i yelled to him that "i know" and slammed the door. my gf roommate was over and asked what i said, he told her that i knew and he went and hid in his room to text my newly recent ex. I then began to text her as we decided to be friends as much as it hurts, but i still love her and will always give her another chance if she would let me. Needless to say i didnt know she actually cheated on me until i used some psychology on both of them and pinned them against each other to find out the truth. it worked great, a little too great. My question is what should i do. i have talked to my roommate and i told him that this had better be worth it to betray me in such a way. i will give him credit that he said he honestly thinks it may be. Regardless i started really talking to her to find out really exactly what happened, and as the day went by i le

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