In my sitch, the OW was in a similar position to me in that she had 2 D's similar ages to mine. She was divorced because her H had an affair and they didn't get through it, they got divorced. She wanted a fling, she didn't want commitment from my H, she wanted sex, and some excitment in her life. She got that for a while and she led him on, willingly it seems. He stayed here and continued with her, (told me it ended) I bet he was feeling like the most wanted guy in town! But when the s**t hit the fan and I told him he had to leave more than a year after BD, things went haywire, she must have got scared and their fling fizzled. She never really wanted him, she couldn't give up her child support anyway, and she'd have lost that if he'd lived with her, she just wanted a distraction and he obliged. She gave him some attention when I was busy looking after my D's and my dying Mum.
I could never understand how she could do something like that when she knows how it feels, it happened to her too. She's a real sado, but it doesn't excuse his part in it too. He was weak and blinded by a bit of attention, he thought it was love. I think he's beginning to see it for what it was now, a sordid adulterous affair, not all hearts and flowers. He's starting to reconnect I think, but a long way to go yet.
OW/OM have no morals, they stink, as HB says, the karma bus is coming!