Strikes me vibes, that a lot of us have something to be bitter about, if we let it get us that way, but I like to think some of us are better than all that and can rise above it.
Believe you me, I have plenty to be bitter about - with both my exes, but I'm not because it would destroy me and make me a different not-so-nice person. I have not let my experiences make me think that all men are barstewards - just as not all women are grade one b1tches.
You'll be fine bob - love your kids, embrace any new love that comes along, and like vibes said - play smart, be prepared to play long. You'll come out of it with your head help high and your pride intact. She'll get fed up trying to entice you once she accepts you are just not going to play her game her way.