Most Helpful Girl
Its certainly annoying but i think you just have to ignore it. Unless it becomes relevent1
Most Helpful Guy
You know what?, the more u get angry and the more u get pissed, the more she is going to gravitate towards the ex.
And lets face it, she is still going to be emotionally connected to the ex coz she had more timing with that guy and u just met her.
The best thing is to tell her "hey, im not ok with u being with ur ex, when u are completely done and over with your ex, then give me a call"
and then, u walk and never look back.
Coz u cry and whine and fight with her but never leave her so she has no consequences of fucking her ex and still keep u in the background.
Walk away dude, have some self respect.1