I don't really care for the LTR. I'm probably going to break up soon anyway.

But I'm curious, for the sake of any future relationships I may have. A girl is liking literally every single one of a guy's instagram pictures. What is my best option in this case? Confront her inquisitevely by asking what she's doing? Confront her aggressively by telling her to stop doing that shit? Not say anything because confronting would appear needy?

I actually normally won't care if it's some celeb or some gym guy posting pics. But I'm 90% sure it's a guy she told me about that she hooked up with before I met her. I am not 100% sure of that, but I don't think my girlfriend is the type to like every picture of random celebs - she usually likes the things of people she met before / friends.