My boyfriend spends a lot of time with another girl?

I have been with my boyfriend for 18 months. I was with him before he went to uni and met any of his friends. We are both at the same uni together in different years and so we have different friendship groups. My friendship group, both girls and boys include my boyfriend in lots of events, he has been asked to all the big 21st parties, other events and there are a group of us going away in the summer and the boy who is hosting it asked me if my boyfriend wanted to come. However although his boyfriends are welcoming to me his girlfriends aren’t. If I see them around and say hi they almost ignore me and I rarely asked to stuff they all do as a group. They all seem to have boyfriend’s and girlfriends that are all in the friendship group.

Anyway there is one girl who my boyfriend spends a lot of time with on a 1:1, they play tennis together go for coffee and drinks together which is fine but she phones him when she is feeling down and depressed and asks to meet him to talk about it., she doesn’t phone her girlfriends. She texts him to ask him to turn his location on so she knows where he is! To be far he did ignore that text. Last week I was at his house with his friends, including her, they all decided to go out clubbing but my boyfriend and I decided to stay at home. 10 mins later when were in bed she came into his room without knocking as she had lost her vape and wanted to check it wasn’t in his room. He did get cross about that. I have spoken to him about it and said I think it is a bit strange the way she calls him all the time etc. He says I don’t need to worry. I do believe that he is not interested in her but I get frustrated that he doesn’t see why I find it strange. So with that and the fact I don’t seem to be included in any of the things that his friends a bit like I am not a priority in his life. I don’t know whether I am overthinking it all or being too sensitive?

My boyfriend spends a lot of time with another girl?
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