Dude this woman sounds like major trouble.. Even though you both may have spent lots of time together, trust me woman can still easily keep another man in the loop..
Her chitty behaviour towards you, only 3 months in, is a huge red flag..
She is mentioning other dudes, she is TESTING you.. to see of you cave in to her frame.. this is DREAD tactics she is applying..
Her bichy behaviour could also suggest there is another dog in the yard..
Either way, what really matter is this.. Do you really want to continue being treated like this?
Chances are things will only get worse.. Personally if a chick told me there are other dudes she is interested in..
I would immediately drop her like a sack of spanners!