WTF!?!?!?!?!

So my dreams have been crushed, yet again. Last night I was talking to my boyfriend online and he started going on about something that has been bothering him. He tells me that he loves me, I am the best thing that ever happened to him, he really thinks that I may be the one......but he needs to break up with me because some day he "might" hurt me! What?!?!? Can someone explain this to me? He has been seriously fucked with in the past by another woman, and I know that has a lot to do with this, but as I told him, you can't let your past dictate your future. I am just so blown away by this. I'm hoping that he changes his mind, but I have a feeling that he won't and that just hurts me so bad. So now I'm wondering what other shit can happen to me. Honestly, I just want to know what is wrong with me? Why is it that when everything is going great something always happens? I swear I am just going to give up. I feel like my dreams of getting married and having a family are never going to happen. I wish so much that wasn't the case, but the farther I go in life, the more I realize it's just probably never going to happen....and it sucks.