Maybe I am boring housewife exhibit A -- I don't exactly have a string of hot lovers in the wings, so I can't say anything intelligent about the ups and downs and difficulties of breaking things off, from a personal point of view --
But I have been tempted, and I have given in to temptations, and I have seen the devastation of it, and I have turned my back and run from temptations. The mechanism of how all this works is the same, IMO, whether we're talking about the "charge" you get out of marital infidelity, or out of wasteful spending, or deliciously scandalous gossip, or whatever other sinful thing it might be.
It might help to try to see with other than your physical eyes.
I'm sure there are positive qualities in that woman or you would not have been drawn to her -- and the same with you for her. But for the purposes of this exercise imagine this--
That you and she both are covered with a nasty stinking flesh-eating loathesome residue from your sin together. And every time you and that woman think about each other -- and especially if you and she should even be in the same room --
Imagine the same demons that gleefully painted that... excrement... on you, those same demons are gatheirng in the dark corners of the room, watching you and that woman. Watching. Waiting.
They glory in debasing you, you see.
They get an orgiastic sort of pleasure out of writhing around all over the two of you while sin happens.
Now, you may be one of those Chistians who don't believe in evil, or who don't believe in demonic activity. In which case using your imagination this way is a simple mental exercise to try to create an aversion to the sin(s) of this situation.
I'm not one who sees a demon under every doily, not at all -- but I do not discount the Prince of Darkness.
I really do think he enjoys our sin.
We need to stop giving him reasons to be happy.