Boyfriend flirted with waitress and followed her on insta, should I worry?

Anonymous
I trust my boyfriend (26) 100% and I never have any issues with him following models on instagram. However we were out to dinner a few nights ago with some friends, and while I was in the bathroom he was flirting with the waitress. When I came back he was bright red and continued to flirt with her right in front of me. Later that night I (21) asked him if he thought she was cute (It wouldn't bother me whatsoever), and he said no. But yet he still made the effort to find her on insta and follow her (we were visiting a different state). I'm pretty lenient when it comes to relationships, because we're still two people who have different lives. But I was curious if this is okay in a relationship of 2 years. Personally, I wouldn't really do this to him let alone follow a cut server after a night out. I work in the restaurant industry and I know how it feels, it's straight up creepy af.
Updates
+1 y
So he unfollowed her and was very honest about everything. I never set any boundaries regarding this issue, and he completely understood that it was disrespectful to me and our relationship. Thank you for your advice!
Boyfriend flirted with waitress and followed her on insta, should I worry?
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