I'm an M early 20s in a 1 year+ LTR.

I post to instagram infrequently, generally if I see a car I like or whatever is interesting that pops up. I've begun to notice a trend, whenever the girlfriend is in a pic, or she's mentioned, there's the same crop of girls who like the post, and otherwise don't give a toss about the other posts.

Is there a way to gauge whether this attention means anything and is there a way to turn them into plates without being a cold messaging social media creep?