Take this as you will, but I have been married for 14 years, my wife has known about my AB side for all 14 plus several months before...right now we are absolutely miserable! She hates my AB side, always has. She tried once or twice to "participate" during sex, but I believe she hates it AND me more because of trying. It's not our only problem, but one off our biggest. She won't talk about it now, just like "then" and refuses to talk about it reasonably. I have worn diapers around her under my clothes, with only a robe on, and with nothing else on, she looks quickly, then ignores me or gets pissy and goes to the other room. When I wear them to bed, she won't touch me.
So if you want this relationship to work, give up your diapers and your AB side of your personality...otherwise give up the girl, if she doesn't come around to the idea BEFORE you put a ring on her finger.
I know you can't give up your AB side, at least not easily. I have tried to do this for my wife MANY TIMES!! Going as far as going to see a hypnotist and that didn't work either. I guess my willingness isn't strong enough or something, but I wish I would have known everything that I know now, back then.
Either way, Good luck to you.