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

I'll keep this short. I'm sure I'm not the first person to have this problem.

I'm 18 (almost 19) and I just moved from my hometown with my boyfriend of three years. We're young, yes, but we care about each other very much, and are very mature living in our own apartment, paying our own bills with steady jobs, etc. We're attending school, and we're happy.

I love him very much, truly, he's my best friend. But lately I keep on having these fantasies about cheating on him, and I feel so guilty. I would NEVER do something like that in real life, ever. We have a great sex life, but it sort of feels like everything is only ...anatomically... correct, if you know what I mean. There isn't really that FIRE, the sexual enjoyment has really just been reduced to physical reaction. Does that make sense?

I'm getting bored. I'm so young, and I want to date people like a normal college student. I want to have bad breakups, and first dates, and I want to sleep with other people. But I don't want to break up with my boyfriend. I would die without him.

I'm so confused, and I'm getting worried, because I don't ever want to be in a relationship where I'm unhappy, because I feel like that's unfair to my boyfriend. He's the sweetest guy, and he's so faithful to me, and he treats me so well. I just want to fool around! The idea of just KISSING a stranger gets me crazy excited!

What do I do?!
<bot>: I'm getting cagey in my long-term relationship and I fantasize about cheating and having relationships with other people. But, I love my boyfriend!