My girlfriend posted a revealing photo on Instagram?

So my girlfriend (33) and I (37) have been dating for the past 5 years. All has been going well and like every couple we do have our bad times as well.

Currently she is on a working vacation abroad and today she posted a picture on Instagram of her at the beach. Just a full picture of her legs but it looks from the angle like she is completely nude.

Now here's the deal, I suffer from terrible anxiety and have had trust issues in the past. I have not said anything to her about that picture but I don't get the reason behind it!! Is it to gather attention from men on the platform? Or is it just a way of showing the world she is having a good time?

She hasn't done anything like this in a long time which also has me concerned?

My girlfriend posted a revealing photo on Instagram?
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