Came across a Facebook message DH had sent to my 10 years younger, and very attractive, sister. She had asked him a totally innocent question and he had responded starting with ‘hey, my sexy sister in law’. Then sent another message straight afterwards saying that he had forgotten to add a kiss.
I am quite pissed off about it (I don’t think he expected me to see the message but he had his messenger page open) whereas he has minimised it as ‘banter’. TBH if he’d referred to a female friend like that I’d have been less upset than I am about him referring to my own sister like that. She is a younger, slimmer version of me and I know he fancies her.
AIBU to think he’s crossed a line?