Ughhhh i dont know what to do :'(

So my boyfriend and i got pregnant im 11 weeks and a couple days :) everything was fine then he started acting stupid and he quit his job and put a lot of stress on me . I havent really been in the mood for sex at all since i got pregnant because i work all day then get home tired and sleepy and feeling sick . Well i recently moved back with my mom And he just stayed the night last night . The first hour this girl that has been calling (she has called various times) well she called so they can hang and he said no thanks ...he hasnt mentioned he has a kid on the way or a girlfriend ...so i ignored that. I didnt think it was that serious ..well he left to use the bathroom and forgot his phone and his phone went off and hes been talking to this girl ...i tried calling him and texting him and hes not picking up the phone ...its not the first time he doesnt pick up the phone for hours at a time ...ughhh ...i really dont know what to do ...