Boyfriend post picture/video with other girl?

skyeee01
So my boyfriend goes to university but we are very happy and that works for us, he's only 1 hour away so we actually see each other quite often for a so called "long distance" relationships. A few of our friends from our friendship group from home goes to the same uni as him and that includes one of his "girl" friends. I honestly do not mind him having female friends at all but when i met her for the first time she blanked me and didn't speak to me the entire weekend our group were away for. Our friendship group has told me a few things about her, saying she isn't the nicest and she always tries to split couples in the group up- i know i shouldn't believe everything i hear but when it comes from the majority of the group its hard not to believe it.
Since he's been back at uni this month he has been posting pictures of her and videos of their nights out, mainly on his private story - i don't mind him hanging out with her but it's really starting to make me overthink and i thought out of respect he wouldn't post another girl. I don't know if i am being silly, overthinking and being insecure basically. I'm really just trying to tell myself they're close friends. I trust him i really do but not her. Do i have a right to tell him this upsets me or am i just overthinking this and being "psycho" , i don't want to push him away and make him feel like i don't trust him or like he can't post what he wants or go out with her etc. What would you suggest to do?
Sorry for the long winded post and TIA :)
Boyfriend post picture/video with other girl?
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