Welllllll.. I HAD the opposite issue.
Let me begin by saying that I don't have a hubby..or an intended for that matter...but I did (at one point) have someone of interest in my life. He came along well after my decision to go natural; our situation didn't become serious until after I BC'ed (since we weren't that close he didn't know at the time that I had BC'ed)...so allat was never a factor. His thing? He prefers (would rather) long straight hair. I wear protective styles more often than not..so my hair is in a weave or braids 90% of the time. Once again, protective styles...not the issue. The issue??? Him and I would butt heads the times I let my natural hair breathe. He hated it...with a passive-aggressive passion. A new set of braids or a new weave..got compliments all day...ALL. DAY. But let me rock my fro and it was silence all over the land.
He is no longer in my life, for reasons outside of hair, but it taught me that for some people, while hair isn't a deal breaker, it puts a hold on contract negotiations. I tried to communicate with him, so that he would understand how important his support was, but I got nothing. It is what it is and I never once felt bad when I rocked my fro because it had to be done. I will say this...I promote self-validation to the hilt, but because he was so important to me (at the time), it DID make me feel some kind of way to not get his support. But what can you do? If a happy compromise cannot be met, you have to do what is best for you...IMHO.
ETA: This discussion is probably a factor (even now) because for some it is a very real thing...yes in 2010. It IS her head and she can and probably will do with it as she wants. But maybe all this is deeper than a hair style choice. In my situation, once I looked under the surface of "I like long straight hair"...the fact of the matter was homeboy was shallow..hence why he is no longer in my life. I can't speak to the OP's situation...but within reason, there are certain things one must consider in one's relationship. Should she NOT get a weave just beacuse he doesn't like it..no..not saying that at all. as OP pointed out..initially her dude wasn't feeling the big chop, but he came around. I'd beg to think he would with a weave as well.
~S~