Should I warn my married friend about a flirty coworker at work?

So she’s been at this company for little less than a year and lately this guy coworker who I know been always tryin to talk to her I personally don’t get along with him so he don’t ever speak to me unless work related …. Anyways she’s my to go person and we always talk to each other he been talking to her a lot and she’s married so I’m little worried for her she says they just friends but he litteraly the first thing early in the morning makes his way to her right away and will talk for hours especially when it’s slow should I tell her something or watch in discomfort where this all will end in?

Should I warn my married friend about a flirty coworker at work?
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