If you guys are acting like y'all are exclusive, and never said it was ok to talk to anyone else-I would consider that bad. Like if that was me, and someone did that to me, I'd think, ok, I thought we were getting to know each other, but whatever. And I'd stop talking to that guy. I don't think it's technically cheating-but it's not right either.
I would say it is a Form of "Cheating" because it appears here, Dear... You have Eyes on Someone besides your Honey Bunny. If he were doing this and you found out, would he be this Cheat Sheet? You would need to ask yourself this. Good luck. xx