I went to visit my friend (L) with my 12 yo DS and 14 month old DD. Me and L have been friends about 20 years. She's recently had a guy (B) move in with her, she's known him 2 years after he messaged her on FB and they've had an on/off sexual relationship for 2 years,not exclusive and they now work for the same company. Prior to Saturday I've met him briefly 2 or 3 times,he's met my DD once. She had a contact nap and when she woke I went for a wee,I came downstairs to find DD laying on B lap and he'd finished changing her nappy, L was in the kitchen cooking,it's open plan flat but she was busy and had her back to the room. I was stunned,I stayed for a little while longer,on the drive home it bothered me significantly and the next day I messaged to say I found it inappropriate and unnecessary. She has reacted by saying some hurtful things and blocked me.
AIBU