No because cheating involves value. Cheating on a test or a game to win or to get an A. Cheating in a relationship for lust, money, etc. A situationship has no value so it’s impossible to cheat. It’s people using each other because they can’t get who they really want or they’re too afraid to be alone.
situationship is courting and you can't demand or expect exclusivity without talking about it. i personally wasn't talking to anyone else when i was talking to my now bf, since i think it's strange to want others and then immidiately commit to one person just because of a label, but it's not cheating if you do