What to do...

Ok so, this is only my second relationship and honestly I love my girlfriend to pieces but my friends have told me a few times that I should break up with her because she makes me jealous and frustrated, and now I have serious doubts. In my opinion she doesn't get me jealous as much as her friend does because he is always the person she turns to in a time of need, when I think she should at least tell me she's having a panic attack or some bad anxiety instead of me finding out from an Instagram post that she posted three hours ago. I don't know if I just want this realtionship to last because my previous one lasted 6 months and it hasn't even been a month for this one, maybe it really is time to break up, or maybe I'm just overthinking things and were fine. It's hard to explain because I'm a very complex person when it comes to emotions, but I just need some advice. If you need more details don't be hesitant to ask. I just don't want to make a mistake...