@gift sad, very sad.
I agree that men by design are attracted to the opposite sex as fast as a snap of your fingers - just like that - perhaps the same way a woman subconciously works to attract attention to herself.
But in the same vein, the only thing that distinguishes man from animals is intellect and reasoning - so that's that, no excuses!
Okay now my lame advice:Deal with the outcome...
I trust you're empowered, if not become so...
Lean on God, family, and friends, for support...
Psyche UP, wake UP, dress UP, cheer UP, and just live UP...
Be the best of you, for your own sake and your children's sake...

Maybe it's just me, but people desire what they admire. So don't be spiteful but he needs to see (and not through words) he can loose you, and the Gift you are.