<human>: I've been with my girlfriend since high school, since I was 15 and since she was 16. We were both each other's first and only significant others (not counting the stupid week long relationships everyone has in 8th grade), and neither of us have had any romantic or sexual experiences with anyone else. She's a beautiful, smart, funny, and sweet girl, and she's really amazing, especially since we got to college (we go to the same school), since she's really come out of her shell.

But lately, like the past 6 months or so, I've started to feel...well, weird. I don't look forward to hanging out with her anymore. Instead of saying to myself "Oh boy, I **get** to go hang out with Sally!" (her name isn't Sally, by the way), I usually say "Well, now I **have** to go hang out with Sally." I usually have a great time once I get there, but I never look forward to it before hand. It doesn't help that she's one of those girls who doesn't like silences much, so will keep talking no matter what, often retelling me the same stories over and over again, usually with an exact script.

And, like I said, we've been together for four, almost five years. At our age, that's literally a quarter of our lives that we've spent with each other. I still think she's a great girl, but part of me says "Hey, maybe your **real** soulmate is out there, and you're just not looking for her!" But I feel like an asshole because she hasn't done anything to make me unhappy. 

I don't know. Do you guys think we just need to figure out something to spice things up? I just don't want to hurt her.

Can you summarize the given text in a few sentences?
<bot>: Part of me feels unhappy in my four-year-long relationship, but part of me feels like an asshole for feeling that way since she's done nothing to make me unhappy.