Love / Questions about Polish Men - flirting, cheating, liking? [44]

There's this new man at work who has been telling people around him that he wants to separate from his girlfriend because she is so possessive(according to him). He isn't bad looking really; in fact one or two women have had some interest in him. I noticed that a few weeks ago he was starting to be flirty, occasionally giving a wink or two, giving that mischievous smile or that romantic stare, even at one point asking for my phone number(which I didn't give, of course). Even one of our colleagues has noticed that he seems interested in me. Now I maybe single and not dating someone at the moment but the mere idea of someone trying to hit on me while he is with someone else-I find it annoying, irritating and disgusting. I think that men should first try to sort out their relationship differences with their partners(whether they break up with them or not) before being on the look out for other women(don't you think?). I mean...if he can do this to his present partner, what more to his other future conquests?

My questions are these :

1. Do a lot of Polish men like to flirt while they're in a relationship with someone else?
2. Do Polish men tend to cheat on their partners?
3. How would you know if they genuinely like a girl or they're just playing around?

He would've been alright if not for the fact that he's younger than me(too young, I think) and has a girlfriend(and nope, I do not want to ruin any relationships). Plus, he has been incurring the ire of a few of the colleagues because of his work behavior(read: he hasn't been hard working lately).

Thanks and appreciate any replies.Just curious.