Thinking about leaving

Me and my bf been together for 7 years and I love him more than anything.. We already got 2 kids together now we expecting our 3rd in May... He the best father to them... But his daddy stays with us he's 41, he got a Job, and all but don't help pay nothing... All he wants to do is smoke all the time ( They Smokes Together ) but my bf still pay all the bills and I'm not working right now.... But his daddy been saying with us since we first got our 1st apartment at 18 now we 22 and he has not even try to find his own apartment yet.... I do not like him at all... Me and my bf had 3-4 apartments... I'm just so sick of this just thinking about getting me and my kids our own place soon because I don't know how much more I can take not to mention his brother recently just came also and now we be running short on food and everything I get wic and food stamps for my kids but having grown ppl steady getting high and thinking they can eat my stuff and go blow their money.... I'm trying to be nice since those his ppl but I'm at a breaking point right now.... I just want my kids to have their own room...