He has a WHAT?

This was me this afternoon as I went to pick up Ryan at preschool and his teacher introduced me to another parent and said this is Ryan's girlfriends mom. Excuse me? Let me get my jaw off the floor! He is 3 years old. She said they walk around holding hands all day. And he told me this afternoon when I was asking him about her, he said I don't Muah her Mommy. Ryan speak for I don't kiss her. I was just flabbergasted. I just didn't expect a 3 year old to have a girlfriend, heck I didn't even think he knew what a girlfriend was. *sniff* This is my baby, my last baby. Why are they growing up so dang fast?