Should I leave or stay?

I wrote on here earlier but my mind is everywhere. I'm asking this because I moved 3 states over, got rid of my apartment, have no money like literally none, and I'm living with him at his grandmas house. Right now my boyfriend shouldn't be home for 3 days or so, currently figuring out if he has a mental illness or if it's from drinking only energy drinks, not eating, and barely sleeping. I've been with him for two years and it's been rocky. He has constantly been someway about me hanging with my friends, thinks every guy has been staring at me, etc. Then it shifted to where he didn't notice I was around cause his mental is somewhere else and thinking everyone is on an evil side. Part of me can't handle if he decides not to take meds, or relapses in the future. But another part of me has no where else to go and I have 3 pets I need to take into consideration. He has yelled and threatened his life and is very toxic