<human>: I know this is probably just your typical teenage hormone problem, but I would really like an outside perspective from others who have been there before.

I have been with my girlfriend for over a year; we were each other's first time and have many memories together. However, we seem to argue semi-regularly, which I think is slightly more than usual than is healthy.

Lately, I've grown feelings for another girl I met this year; she's a lot different from my girlfriend. My girlfriend has no knowledge of this.

I love my girlfriend very much still; however I think we fight more than usual and maybe has a short temper with me. Maybe I like the idea of the chase and something knew. I don't want to settle for less than I deserve, but I don't know what I really want. It would break my girlfriend's heart if I went through with it and I want to avoid hurting anyone, I feel so guilty. Has anyone been here before?

Can you condense the text into a few key points?
<bot>: Developing feelings for other girl, conflicted about what to do and want to avoid hurting anyone's feelings. Neither girls know.