<human>: Could you distill the essence of the text into 1-3 sentences?

Well I guess i'll try to be as brief without leaving out too much because we've definitely had our ups and downs.

We've been together since the end of high school and at first we both didn't know where this relationship would go as she's 2 years older than me; we both decided why not just go with it since we really had feelings for each other.

It started off amazing, but as we got closer she started getting angry about the smallest things very often and would say things like I'm miserable when I'm with you, always taking her anger out on me, and when she cooled down from her anger she would apologise and we would make up and everything would be "fine". 

We eventually got to the point where I couldn't stand it and wanted to break up with her. I almost did, but it broke my heart seeing her that sad so we said we would try and be better to each other, which we did and things looked good.

But lately it seems I've been the one getting angry over stuff that she's been doing; one time I took my anger out when she was there and in retaliation she told me she didn't feel that strongly about me anymore.

Eventually I realised part of it was due to my suspicions about her and another guy she's been talking to a lot recently. Deciding that it'd be better and more truthful than trying to watch her moves or being controlling, I told her I was feeling a little insecure, I told her my worries, clarified it and she said nothing's going on; I trust her and I drop it.

A few weeks has passed since and it seems like we're not as close anymore, she constantly lies about going to sleep / other things to talk to the other guy, we're not that intimate and when I say I love you she tries to change the subject.

I would love for someone to tell me I'm insecure and I have nothing to worry about but I would just like some opinions or thoughts.
<bot>: I don't think my girlfriend has feelings for me, or at least not like she used to and she's constantly trying to find time to talk to another guy