So we go out, I hear you cry about your ex and how much he meant to you, rinse and repeat, and then what? I just do this until one of them decides I'm more tolerable than her ex? Fucking miserable
Dude no point on wasting your time. Get in, hit it, have some fun, don't get attached. When she decides to go back to her ex you already had your fun.
Good advice
Seeing you while she is still invested on her ex, is fucked up. So you own her nothing. Fuck her every you can. If she doesn't want to give it up. Dump her.