<human>: Can you summarize the given text in a few sentences?

So there's a girl I met in 8th grade. We became good friends for many years until I move away in 11th grade and we, ironically, start dating. Now things have been just peachy and we've been together for just shy of 3 years (more like 2 3/4) and in the last 2 or 3 months I've been having doubts about our relationship. I feel like my experiences during my first year at the university have changed me as a person and I want to spread my wings and experience all life has to offer without long-term commitment but I feel held back by this girl. I still care for her but I don't know if I love her as much as I used to and, to make matters worse, I've met other girls. Now, with my girlfriend, she was the first person to ever show romantic/sexual interest in me and that's partially why I fell so deeply in love with her in the first place but I've since made myself a more attractive individual and have been noticing more men and women noticing me. I'd never cheat on her or on anyone (unless they did it first) but I really want to experience life outside of commitment.
Am I being selfish? What should I do? Should I break it off? Or maybe call a break?
<bot>: Been in 3yr relationship with first girl to show interest in me, now I don't know what to do because I still care for her but I also wanna spread my metaphorical wings and fly.