I think this is really a question about how you feel. And how your partner feels. More then asking if it is cheating ask yourself if it is something that hurts your partner. If so then its something you should consider. Most the time justifiying it as "not cheating" is a way to allow yourself to ignore that you are disrespting or hurting yoru partner. I think its not cheating in exact termsbut it could be disrespectful.