-Should I stay or go....?

-i just turned 16 n I just had my 2nd child two weeks ago (now b4 you strt calling me a h** and stuff) I'm a very good mother I take care both of my girls, I go to school full time and I work. But my problem is my baby daddy we've been together for almost 3 yrs now and when we were together he was just awsome.thn we had are first child together nd still everything was good but when I told him I was pregnant again he just changed disrespecting me and all this other b.s I need him more then ever now bc are new baby girl has been in the NICU for about 3 weeks now and I don't think I can handle it by myself (i have the support of my parents) but it's not their job to do it,its his I really just don't now what to do anymore