If it's outside of the boundaries of your relationship then it's cheating. If you're not sure what those boundaries are then check with your partner. If you do it behind their back assuming it'll be ok, that excuse won't fly. Tread careful, and chose wisely.
I agree with you guys I haven't done anything with said person because I don't ever wanna be that guy to my girl. It's just difficult but I know what's right just want to be bad at this moment I guess