What should I do when my boyfriend is scared of marriage?

I just had another fight with my boyfriend and he finally admitted he is scared to commit to marriage with me. He says he's just not ready and that he loves me so much but is scared of the next step. We've been through hell and back of 5 years! what should I do?
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well the thing is.. it's not that I'm pressuring him, I have to admit in the beginning I did, we broke up.. got back together, and now I guess I would bring it up.. but I learned not to anymore.. because it'd cause fights.. the problem is everything boils down to it.. he brings it up himself.. its wierd... I tell him I love him and it doesn't matter, but why does he seem like it's always an issue.. always on the verge of breaking up but we end up not..
What should I do when my boyfriend is scared of marriage?
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