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

We are both juniors in college and have known each other since freshman year. Besides small disagreements and arguments, we get along well and love being with each other and love each other. She is my best friend and I am comfortable with her. 

The problem is... for the past couple months or so, things don't feel the same. I still love to spend time with her but I don't feel that strong connection as I once did. I have had multiple relationships in the past but this is her first one and she as brought up marriage multiple times and our "future".  I feel like I'm tied down already but I don't want to lose my best friend if I breakup with her. 

What do I do?
<bot>: Not sure if I want to end a stable relationship with my girlfriend of 1 year. I have lost the "spark"