It sounds like you guys need to be apart for a bit...

Guys are scared. They think they want to marry you, then they get all freaked out and behave in strange ways, because it doesnt do to be a young man and want to get married! (or some such male- psyche rubbish)

But he really isnt ready for this, and he seems to be taking you for a ride. he knows you will always be there if he cant find another girl, so he is having his cake and eating it...

if its meant to be, then you will come back together in the future.

I hope you dont mind me being so frank about it, but I hate seeing people being messed around. I have a wealth of experience of being messed around, and making the decision to have a clean break was the hardest but best decision ever. I hate to think where i'd be now if i hadnt, but certainly not with the lovely man i am with now, and having made all the great friends and had all the great experiences i have had since!!!