We conflict too much and I don't know what to do

Hello everyone. My boyfriend and I conflict way too much and I am totally not sure what to do about it. We are always having arguments, sometimes they are bad ones. He has never hit me before or physically abused me. However, he does yell at me a lot and sometimes he threatens me.

A while back he gave me an ultimatum. He told me I could either give up Catholicism or give him up. Also, he has told me ever since he met me that if I ever got pregnant he would either "stomp on my stomach" or kill himself.

But the weird thing is this, he really helps me a lot with various things. He has helped me to improve myself in numerous ways. He has helped me when I am depressed, prevented me from killing myself several times, and he always makes sure that we resolve our arguments before we get off the phone. I used to have to go to the hospital frequently and he would come and pick me up if I didn't have a ride home. Eventually he became very sick of this and now he gets pretty angry if I go to an ER. He also blames me for a lot of things. He says I have caused him to "age 10 years" and such. I have apologized to him so many times for the trouble I have caused him and he'll forgive me for a while but then once I make even a slight mistake, if he's in a bad mood, he'll get angry about it again.

I really don't know what to do. On the one hand it seems like he loves me but then on the other hand it seems like he hates me at times. I know he has depression and he takes an anti-depressant every day for it. I don't know if he has ever been diagnosed with anything else or not to be honest with you.

If you all could please provide me with some advice, I'd appreciate it. I honestly want out of the relationship but I know that if I tried to leave, he'd bug me to death until I took him back. I know this before because I have tried to leave him in the past and he'd either call back or come over to talk to me. Of course, I always answer the phone or let him in which I know is stupid but I love him too. I just know it would never work out between him and I. I don't know if we'd work out as friends only or what but I am tired of being in a romantic relationship with him. Please help.

Cloud, yah, it sounds like he's been abusive. Even talking about doing stuff like that is very bad. You're not responsible for his condition and he might become even more abusive.
Leave him and then ask someone to stay over at your place, to give you support so that you won't answer the phone or let him in the house. Explain things to him so you can get everything off your chest and maybe it'll make him see that he needs to change too. The simple fact that he says he'll change doesn't mean that he will, though. It sounds like he has a hold on you and you feel too sorry for him to not talk to him, but you have to hold your ground. I doubt you could be friends yet.