The 3 of us met at the same time, but when he and I divorced due to his infidelity she was very much team me. He blocked her at the time of the split when he found out she was using f'book to pass on incriminating details to me.
This was all about 4 years ago and I know for a fact she has not seen him since, nor would she ever. Today, following a difficult day of 'shared parenting', I went on his f'book for the first time in forever. I was shocked to see her named as liking several of his posts over the last few months. They were all non-personal 'right on' political ones, but it has shaken me a little. Our divorce has been acrimonious and he has been a shit towards me and not the greatest dad to our dc, who I know my friend is very fond of. So it feels disloyal.
I'm not active on f'book and only use it as photo storage, which my friend obviously knows. AIBU to feel upset?