I would say it depends on if a man wishes to just bed you, or if they want something more than just sex.
No for "just bed" means you are ignored until you come back around. Of course, the subject of your attention lives well (hikes, plays, tells tales around the office or social circle of what a good time he's having). You'll be back, for ego's sake if for nothing else.
If the "no" is from a woman who might be more than bedroom entertainment (note: if he's married as you've implied this is unlikely) then backing off for a time and presenting her with alternatives, i.e. platonic friendship, is an option. Of course, then you play a variation on the "living well" theme and she'll come around sooner or later. The difference is in the levels of engagement. It also gives you (the male) time to decide how much effort she's potentially worth...and if she isn't, a graceful exit.
Basically, Ms. Tis, if you desire, then you are screwed. Depending on his level of sophistication, he might be playing games with YOU. If he cheats on his wife, this is likely.
I always feel badly for the "other women". They are doomed to be playthings, even if the guy is sincere in his affection. There is complication, and a problem from the START of the relationship that there is a lie at the "base" of it all. Such relationships are great as distractions form other issues in life...but are not good as actual relationships.
Keep saying "no". Tell him "You're married, and I don't need the drama". That takes the "desire" aspect out and makes you less play-able. You can also play the bitch and say "You get me when the divorce is final, until then I'll just show you my cleavage."
Or you can just go look up Greg, I've heard he's fun.