Honestly im just so fed up w this relationship . where do i start idk !

My bf is a drinker. And when he drinks he acts a complete fool and i hate going out w him cause he just embarsses me . i dont wanna be around him when he acts like that. we have a almost 2 yr old and im 7 months pregnant . Friday is pay day he told me he asked friday off and i told him why you are just losing hours? He makes just enought to get us by. Plus his mom nd sister live with us so his mom helps us out . his mom and my bf both go half on rent and bills and food . so anyways he asked for friday off i know its cause he wants to drink all day nd get drunk and he starts his drinking early in the day nd start acting stupid within 2 beers . we were supposed to go to walmart friday so we can buy baby clothes nd other stuff but you know if hes gonna be drinking i just dont wanna go no where with him . i tell him i dont want u drinking friday and he just tells " i dont care"! . i told him i will probaly leave if he starts drinking and he says cool. Ive left before because of his drinking but eveeytime i leave he begs for me back saying hes gonna kill himself and he promises to stop drinking so i come back and things just go back to the way they were . plus i dont know where to start if i were to leave him i never finished school i would have to get a shitty job and i dont know how to drive and childcare is really expensive . and honestly i dont even have no where to go now because when i would leave i would go stay at my older sisters . but she is going thru stuff and lost her house nd what not so that's a no and i cant stay at my moms cause my dad dosent want me or my kids there . im just so lost and depressed in my life and i dont know what to do i tell him im depressed and he acts like he cares but just starts acting the same 2 days later . :( i know i put myself in this situation cause i never finished school i got myself involved w a drinker i keep getting pregant but i love my kids💔 and i kept coming back to him but now im really opening my eyes and i just dont know how to get myself out of this or move foward ..