signs /experiences of monkey branching?

how did you find out your ex was monkey branching? either while still in relationship with them or afterwards?

We’ve been officially on break(?) only a few days. i have a weird gut feeling about someone my ex said was a friend/coworker and im not sure if im just being paranoid. how do you get over this awful feeling??? regardless if he did monkey branch its so hard for me to detatch right now. my previous post on my profile explains more in depth (he is gone to work on himself which i get, but im uneasy about.)

i dont think he wouldve cheated because that doesnt seem him but i just have this awful feeling. i asked about her one time and he assured me theyre all friends at work and im not sure if this was about her but he said his one coworker he hung out with got a girlfriend but i still feel weird about her

i stalked her ig the night all him and his coworkers hung out and she posted them hanging out and her wearing his hat and he was a pic she took on one of the slides and he commented like ‘take my hat off loser’. and she commented ‘go fck urself <3’ and it just sat weird with me but he said theyre coworkers and she might have a gf so idek

he always felt weird when someone random would comment like Hey on my instagram so it felt weird he didnt see anything weird about her