I don't play games either but when you ignore someone for bad behavior and move on with your life it tends to make them chase you more. I keep it moving and don't look back because exes are in the past for a reason.
People say this a lot but it has not been my experience.
When I ignore people they tend to just disappear / fade into obscurity, which tells me that they didn't give a fukk to begin with. This is especially true for girls.
I will say that I do have ulterior motives though. & this is not something I'm proud to admit. I have friends who were kinda dikks and the relationship was tilted in their favor initially but I'm still talking to them either because (1) They have something I want or (2) I was the bytch in the relationship for so long that they warmed up and we turned into actual, legitimate friends. There are ppl out there who are very guarded, so that "bad behavior" you see initially might just be insulation to protect them from the a$$holes of the world but once you get past the tough exterior they are actually pretty alright ppl. Of course you have to be very careful with this. If you are tolerating bad behavior but don't have an elaborate and realistic end-game (a la The Prince by Machiavelli or House of Cards) then it's better to just dead it. It's not worth it.
My conclusion from my small experiences dealing with ppl is that there are no hard and fast rules. What helps in the long run is being positive (if you start off by assuming everybody is an a$$hole well ... good luck), being very observant (actions speak louder than words, and nonverbal cues / body language are underrated) and of course having your priorities in order (having an end-game).