After The Split-Up

So I got divorced about six months ago. My ex-wife wanted the house and kids, and I didn't really fight it too hard. Just kind of moved into my old studio apartment, started painting again like before we met. Got back in touch with some friends from art school who I lost touch with over marriage. Anyway, one night at a bar, an older woman hit on me. She was like fifty or something, but had this wild energy about her that made it hard to say no. We went home and she told me she wanted me to play the role of her ex-husband who left her years ago. At first I felt weird, but she convinced me by saying it would be a way for us both to work through our past pain. So we started this thing where I pretended to leave again in the middle of things. It was odd how turned on she got when I did that, like something from her old wounds clicked with her pleasure centers. And honestly, it made me feel weird too after a while, reminded me way too much of why my marriage ended. I guess what bothers me is pretending to be someone else in bed just to get off, especially when you know the person has real pain there that's being exploited for sex stuff. Not sure if I'm the asshole here or she's manipulating me somehow, but it definitely doesn't feel right. Still can't shake this weird feeling every time we do it.