Most Helpful Guy
You know your boyfriend, we don't.
Cheating takes many forms. If he's looking outside for something, it's a sign something is missing in his eyes from your relationship.
I'd strongly suggest you try to talk to him rather than asking this community for advice.
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Most Helpful Girl
Standing alone i would think "oh he just saw an opportunity to make a meme" but the other details do make it sketchy1THIS IS NOT RELEVANT ANYMORE