<human>: Hi reddit,

I will try to be brief. My SO just told me she will have a quick sandwich with a coworker because he did not bring lunch to work, so she will go with him to disconnect a little bit from work.

They seem to get along pretty well, which is fine, but it seems to me this guy is flirting with her and she has been always quite oblivious to flirting so she may not realise about this.

Now, with this information only, I would not worry in the slightest, but some weeks ago, this guy went to an event, not far from where we live, and sent her a picture where he was drunk with a friend and told her if she wanted to meet up there. I am confident she's not hiding anything and I have complete trust in her. This guy is married and has kids, but you never know.

What I ask you reddit, is if I should talk to her about this, in case this guy tries to make a move, seeing she will probably not realise until it's late, or if there is nothing strange with this behaviour and it will look like I am overreacting.

Could you distill the essence of the text into 1-3 sentences?
<bot>: I think my SO's coworker is flirting with her but she does not realize. Should I talk to her or am I thinking too much?