Current spouse or any spouse?
Also, do you have a specific definition of cheating in mind? Like, what about online sexy talk? Or a platonic kiss? Is it whatever I would consider cheating, or what my wife would?
I think it would always have to be what the other party would consider cheating. I had a close friend in college, my study partner, that I met because we had the same major and were on virtually the same timeline. We had maybe 70% of our classes together and ended up planning it that way as we progressed so we could help each other. She was attractive, smart, funny, and we were very compatible. I had more in common with her than I did my wife in lots of ways. I would have been all over that if I hadn't already been married. But it was strictly platonic. However a few times my wife expressed that she was uncomfortable with the relationship. I reassured her nothing was happening, because nothing had happened, physically anyway. I imagine there were a few times that this woman and I shared intimate information with each other. She was relatively newly married, couple of years, as was I, and it isn't always peaches and cream in a young (or any age I guess) marriage, so we were sounding boards for each other. We ended up graduating together and had our arms around each other at graduation. Later my wife told me she felt I had been cheating on her with this other woman. She knew we had never done anything physical, and told me she knew that it was innocent, but that it put a knot in her gut to think about it at all. I suppose the relationship we had was just short of a marriage...very close friends. I didn't get it at the time because I was young and stupid. But to this day it bothers my wife a little bit, even after we have been married for 30 years. And I feel a little ashamed at my behavior, getting so close to another woman, even though I felt it was completely innocent at the time.
So was that cheating? I didn't think so at all back then, but the emotional aspect is just as important as the physical in some ways, so for my wife, I think she has the feelings as if I cheated even if nothing physical ever happened. I might have to say that it was cheating on some level. They call that an emotional affair I would guess, although usually that has a sexual component to it, sexy talk, flirting, minor touches, sexting even. This had none of that, but it was still fairly intimate.