Ok long story short (as poss)
Recently started 'hooking up' with a guy I used to work with , he was my ex boss actually but hasn't worked at my place of work for a few years , we started chatting/flirting on messenger and decided to start getting together as a FWB kind of situation as we were both single/separated,
There was nothing to suggest on his social media page that he was in any sort of relationship and because I knew him previously (although not really in a personal capacity more professional) I was inclined to believe him , he is a little older than me but was always very sweet and gentlemanly towards me so he felt like a safe place, I knew his ex/mother of his kids name as she worked at where we worked many moons ago and we have a few mutual connections although do not know each other directly, her FB profile was locked and her prof pic didn't give anything away but I came across an Instagram account that had a bit of a cryptic name (like not her first/last name more of a pet name)and her profile is public and includes photos of him that suggest they are still in very much a happy family .
i feel so effing stupid and guilty towards his partner who seems such a nice person , I would never have gone there if I had thought they were still an item, i have messaged him to call him a bell end and I allowed him to reply as I was interested in his excuse and he gave the old 'separated but hiding it from the kids ' bollocks which i dont believe for a second and I have now blocked him, im 30 years old and i cannot believe I have been so naive .
im really tempted to message his partner and tell her but i dont want to hurt her and also dont want to cause myself any grief, as although i feel so bad on her behalf, i know deep down it's not my fault
So annoyed.