If you haven't spoken to him very candidly, go ahead and do that please. I've experienced something similar and it was related to her not being happy either. Her friends and social crowd liked to dress up and show off their wealth. I on the other hand am a miserly person in the sense that I dress to look presentable according to what I think is acceptable she wanted me to dress to impress. Talk about the very materialistic things her friends were into when I was with them. In short she was in an a Competition with her friends and I was part of that. I never knew this. We parted ways because she had eventually openly expressed her desires to change me. I suspect there was someone before me who fit the bill but that didn't work out and she was hanging on to the idea of that person, whome she wanted me to become.

Your case can be very different. But if you ask him bluntly with out judgement if he could what would he change about you. Express yourself as well and tell him what version of your partner would be a better fit for you. See if you guys can compromise on some level. In my case I couldn't compromise and we parted ways. In your case, only you guys can know.

If things are past communication fixes. Then simply part ways. Do it in an upstanding and honarable manner so when everything is over, there are no regrets. Accept that you guys tried something it didn't work out. You gained experience and knowledge which will help you in making better decisions for your future and it wasn't time wasted.