Is casually talking to someone of the opposite sex on Snapchat cheating? No flirting but boyfriend doesn’t know about it?

We send 3-4 snap pics a week but it’s just of our work etc, no real chatting, I do find him attractive but wouldn’t actually ever do anything with him as I do have a boyfriend. It’s almost like a bad habit now when I go on to my Snapchat app.

Is casually talking to someone of the opposite sex on Snapchat cheating? No flirting but boyfriend doesn’t know about it?
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