girlfriend liking a guys shirtless Instagram pics from a year ago. Should I be worried?

Anonymous

My girlfriend went to the army. I chose to stay with her because I actually love this girl. Solid 8/10. I can see a future with her. Anyway she finished basic training and is now in more training but they all have there phones back. I saw a guy liking all of her new Instagram pics so I lurked his profile. It's a guy ( black) she graduated basic with In her platoon.
Gf liking a guys shirtless Instagram pics from a year ago. Should i be worried?
There's one new pic in his army uniform she liked and i have absolutely no problem with that. I kept scrolling and there's a selfie from 9 months ago she liked then a shirtless picture from a year and a half ago she liked. To me that's super weird and sketchy. That's obv telling him I think you're hot. Year and a half ago and just choosing that one? Am I being insecure or should I bring it up to her? If so how would you bring it up. (I see a future with this girl) she's only 21 though. Possible slut especially seeing she's in the military. Srs answers please.

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girlfriend liking a guys shirtless Instagram pics from a year ago. Should I be worried?
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