in need of advice.

im 19 i have been with my boyfriend for almost 2 years. we have a 8 month old little girl and we are splitting up..... i am hurt from the past and i dont know how to get over it. when i was 4 konths pregnant he cheated on me. i was living with him at the time. then i moved back home. he came back to when my daughter was a month old. all we do is fight and disagree. i cant get over that he did that. and not to mention he has a son. i love his son but he has court set dates to see him and i totally get that but in over a week he has only been here to see his daughter one time. he has taken days away from her and i and it is spliting us apart. all he ever wants from me is sex and then he goes to sleep if i dont give it to him he just goes to sleep i am just depressed and need help through this......