To play devil's advocate, I thought it would be hot if my wife spontaneously met up with her bull behind my back, and I found out afterwards through smelling his cologne it aftershave or the smell of sex on her, or her casually telling me about it before bed or something. So she did it, but told me about it in a text conversation and sent me pictures of the two of them in our bed together, sweaty and with a post-coital glow. Did she cheat on me? Probably not if the definition of cheating is being deceptive or going outside the bounds we set for our marriage. If you go by the definitions a lot of people have talked about here, maybe so, but if that's the case, I all but asked her to cheat on me. So if that's the case, does it matter if she cheated on me? She certainly wouldn't need to come to a forum and ask.
I'd say the reason that "cheating" is a problem is because it involves doing something that would hurt your partner. If you have to ask, it's my hunch that you're asking people to justify something you're considering doing, knowing full well that it will probably hurt your partner. If that's the case, I'd advise against it. If it's not the case, I don't understand why you're asking the question. The important question is whether what you're doing would hurt the person you love, right? Not what people on the internet call what you're doing? Who among us is qualified to tell you whether this would hurt the person you love? That's something you're going to have answer for yourself, even if you don't like that answer.