Not sure if relationships is the right place for this but it can be moved if need be.
Best mate phones me up tonight all upset. The story is thus:
She's been dating a bloke in his twenties for the last six months (she's 38). tonight both her and her DS of four come down with major tummy bug. She phones DS's father but he's out of the country and can't help. She doesn't really have any close friends of family where she lives so in desperation she calls the boyf.
Boyf comes over, puts her to bed with a bowl and some water. A short time later she gets up and goes to the bathroom where DS is standing in a shallow bath and boyf is rubbing his bum crack.
She goes nuclear. Boyf says he had an accident and he didn't want to bother her as she is so sick. OK bit silly but he's not a parent and has very little experience of children. She throws him out.
I tell her that perhaps he was just trying to help and she is now not speaking to me either.
Is she over reacting or am I just a crap parent? 
Lizzie