Many of us married wonderful spouses, only to realize that this will always be a problem for them (us wearing diapers without physical "need"...), so you should be very thankful for finding someone as understanding as your potential spouse. Keep in mind there will be 1,000 other things you'll have to agree on in life to make a marriage work, but starting with someone that can accept this bit of weirdness is a great start. Give her plenty of attention and understanding, as well...
Thanks, she means the world to me and has always been there for me and understands me. She knows what I've been through too. It's very hard to find someone like that now of days.