Theres only a few people that know about my diaper wearing needs, 1 is a close female friend that is just cool with everything, 1 is a ex girlfriend that still remains in contact here and there and the other is my current fiancee who is just an amazing / awesome woman.
I didnt tell my ex girlfriend about my DL desires until we were a year into our relationship and were thinking about living with each other, I more or less told her this is what I do sometimes, she was cool with it but never really got involved with it either.
My fiancee on the other hand, I told her pretty fast into our relationship, we fell pretty hard for each other right from the beginning and after a month or two of serious dating I had to open up to her because I didnt want her heart or my heart to break if this was going to be a deal breaker. Luckily for me she was delicate and kind of tip toed around the who subject at first, then she finally came around one day and rather point blankly asked about it, I was open and honest, didn't feel hostile or anything and we went from there, we're now a couple years into living together, getting married this year and she has done a 180deg turn, more or less becoming a caregiver and is passionate about me and little me.