I'm unsure if my ex was just being friendly or to read a bit more into it. He dumped me a few years ago.
We are in the same venue, haven't spoken since breakup, I'm with my cousin, he's with his brother, I spot him, he spots me, comes bounding over enthusiastically, taps me on the arm, asks me how I am, says it's nice to see me. Took me a bit by surprise as I never thought we'd speak again after how things ended.
AIBU - he's just being friendly
AINBU - sounds like he could be hoping to reconnect or something