I love him but....

I love my bf but sometimes he can be very erratic when we fight. It scares me and makes me think he’s mentally unstable. I don’t think he’s gonna hurt me, but seeing him like that doesn’t make me wanna deal with him.He has ADD and anxiety and lose self esteem I suppose from not having friends, but to me it’s not the end of the world and he has me🙋🏾‍♀️ I’m guessing im not enough and he wants friends. He says he’s just expressing how he feels but idk. I get scared when he talks about marriage because of this. Maybe we’re just not meant to be 🙁. This sucks because I’m tired of seeing everyone married and having kids and I can’t even get that.