Why am I not at all interested in a relationship? I don't want to be single anymore?

I think it's the fact of your two past relationships scared you so you're afraid to get close to someone in case that happens again. You feel as if you attract those type of people, the ones that will be gone quickly because they're no good and do something stupid. You're afraid something like what happened might happen again. But it's okay. You'll find someone soon. Someone who does deserve you and will treat you right. It's okay that you're scared. There'll be someone who's right for you.