Partner messaging flirty messages to girls. ok or bad?

Recently I saw a snap between my partner and another woman telling her how sexy she was.
when I asked him if you was texting other girls he said no and then proceeded to delete the message.

I guess I want to know if there’s anything I should worry about

thanks!
Updates
+1 y
Ok, yes I know it’s a form of micro cheating even though he isn’t physically sleeping ( I don’t think) with this girl. I’m not being blind. I guess I was just wondering if guys or girls do it to get some sort of self validation
It’s a hard situation because we have been together 3 years and we have a son so I just needed others to confirm what I was thinking before I make a decision.

Thanks for all your advice ✌🏽
Partner messaging flirty messages to girls. ok or bad?
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