My fiance has a diaper fetish?

He just recently told me. I love him to death, we're getting married in three months.. but I'm so turned off by it. I wish I wasn't, i really really wish I wasnt. But the whole thought of it just makes me uncomfortable. I know that its actually pretty common, but it just bottom line creeps me out. I wish it didnt, but it does! What should i do? im afraid this is going to make me less sexually attracted to him.