Can you tell me what you think is really going wrong in this picture? (your opinion)?

last friday night i went to bed and my boyfriend was still up and he told me he was going to go over to a friends house and that he was going to take my keys and my phone with him in case i needed to call him cuz he didnt have a phone and he said he would be back around 9 or 10, well anyways i was like ok and went back to bed. i was up all night long waiting for him cuz he didnt show up and i didnt think to look at my computer so at 4:20 in the morning i went and looked at my computer and he had instant messaged (IMed) me saying that he was not comping home cuz the cops were thick and he was going to stay at his moms house, so i was like ok whatever. saturday morning around 9:00 he IMes me saying he wants to visit with his younger siblings and he didnt get payed till late that night, and yes i was kinda upset cuz i had a check to cash and i didnt have any cigs or toilet paper and i couldnt do this while i didnt have my keys so i bitched to him about it and he got mad and signed off, well anyways i did the opposite of what he told me to do which was stay home all day, i went and got my cigs and **** and wasnt home all day just to piss him off (by the worked and i'll tell you why in a sec). well later on that night i actually went home and found on my computer that he had IMed me say this "you r a ******* nasty slob, i dont want to be with you anymore cuz you are a drama queen and i w/ deal with it,, we are done" well for one how am i a nasty slob when i was the one picking up after his dumb ***? anyways tell me if i was wrong for this, i went to the store and bought a bottle of vadka and a jug of juice and i drank it all by my self with in like 20 mins, (now mind you this whole time all thats going through my mind is hate and kill) well when i got done he walks through the door and i guess i went right for the throat and squeezed, well then my manager of the apartment building came up cuz i was so drunk and i was being very loud and obnoxious and evidently i pushed my manager into the wall trying to catch my boyfriend to punch him but my manager grabbed me and put me in a sleep hold so i would calm down. but anyways four days later my boyfriend calls and says he dont want it to end like that so he wanted to get back with me and i dont understand why. ppl have told me that they think hes trying to get back with his ex and that hes just keeping in contact with me just in case it dont work out with her so he still has me on the side i guess but i dont know. im really upset about it although i dont show it to him. i just want to know whats really going on and i feel that if i come on here ask for your guys opinion that maybe i can get an idea of what i might be doing wrong or that he might be doing wrong. i dont know. but plz no downgrading answers or obnoxious answers i cant deal with stupid ppl right now im hurting enough as it is so plz take this story seriously. thank you and have a nice day