Does love really conquer all?

My guy friend and I have gone back and fourth for three years because he's centered around drama. First it was his ex causing problems and breaking us up. Then it was his "sister" (THAT'S NOT HIS SISTER) And the trust is extremely broken due to him allowing other people to mess up our relationship. So now he's back and says everyone is gone and everything is fixed,and saying how he wants me back.  And I love him I do but I'm not sure I believe him. And he's talking about marriage,but I CAN NOT marry into drama. I refuse. Thoughts?