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. 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.