Sup,
I found myself encountering with this problem more than a few times, and still can't find an answer to it, therefore raising this sticking point. This is where girls bring up conversations 'about men' and their freaking sore brake-ups.

Yeahh, I know, right...
I don't know whether to build rapport on such a negative thing, cut thread or just to be an asshole.
If I build a rapport and find something common as, "Yeah, I know how you feel. I had a gf once... blah blah." If I do so, I feel that she will poop the words 'LJBF'. This also ring a bell that maybe every average dude tries to do that, which obviously we, here in this community, are not!!! haha
If I come over as an asshole, I'll be just an asshole. She probably will not give a shit, and just leave, as in some situations they have a stronger emotional ties with the 'ex' which automatically renders me a '2nd choice'.... Fuck being a 2nd choice, man. (I am letting go of my EGO, but common.. Maybe I would get laid once, if I would accept myself as a beta, but I am looking for more than one-time-fun.) If we accept that this female likes this guy more than ourselves, then, obviously, she will be running back to him at a first chance for some finger-banging.
Sometimes, it is freaking next to impossible to cut thread, as I had once this crazy woman in tears.. OMFG, serioussss??! There was good attraction, it was goin' well - push and pull, eyes, smiles, pokes and so on.. but then, her ex bf turned up and she fucking started shedding tears and I am confused dot F..com. So I started to build rapport about my ex gf and then, out of no where, I became a bit of an asshole by saying, "Forget him, it is not gonna happen; stop acting like a baby and move on." So then, I left and starting having fun like 'I don't give a fk'. I see her then dancing with some other dudes.. Afterwards, she 'passes' by me, like 10 times, with an indirect notion 'come dance with me'. Well, I thought, "Screw, you, hoe. I will not be 2nd option and I will not certainly be like these other guys that will just dance with you just to make you feel better, as this is another one way train ticket to 'LJBF'."
Any ideas, as to what to do? Please shed a light in the dark...
Thanks,
Seven