Is it normal I can never get out of bad relationships?

I have, lots. I tried again recently though, I said "If you're not going to act like a boyfriend then you're loosing your boyfriend status. We're still going out, but until you can prove to me you can be a good boyfriend, we're not going to be doing anything outside of being normal roommates." He's been awesome for the past 4 days! He even said he realizes he takes me for granted! n.n Yaaayyyyy lol