<human>: Condense the text into a few key points

So my gf (20) and I (20) met last year in college and have been through our ups and downs with each other. Recently, I have been feeling less and less attracted to her and want to end the relationship. However, I am afraid to do so because she reacts violently when she gets emotional (freaks out and hyperventilates etc.) and I still love her deeply but the spark is just not there anymore. 

I don't know what I should do. I've been faithful to her and she to me but I catch myself looking at other women and wondering what it would be like to date them. I don't want to hurt her, yet I don't think I should break up with her yet. I have no clue what to do in this situation.
<bot>: I (20) am having doubts about my relationship with my gf (20). I don't know what to do.