Need some advice

I’m a young parent of two girls and one on the way! There dad and I have been together for 4 years. It’s getting toxic now he has anger issues and his mood for Flexes from sweet to just mean because he has mental health problems but he refuses help! He’s definitely not the worst dad he does love them very much but he lost his job and won’t get another so it’s just me doing everything. Now if we were to split we’ve talked and of course he’d still get the kids some days as I’m not that type what so ever! Plus I completely trust his family but my question is does it ever get be easier not being able to have your kids full time? Like I can’t imagine having one night apart from them I love them so so much and do everything for them so idk I’m just trying to see what others feel