I love my boyfriend, but I have a crush on someone else. Any advice?

I can't sleep because I have too much on my mind. It pains me to write this, but I have been with my boyfriend for almost three years, and he's been my best friend since we met. We talk about getting married and being together forever. We're each other's first and only relationship, and I'm asexual, so I've never felt sexual attraction or thought about another guy. However, I've developed feelings for a coworker, my favorite person to work with. He's kind and funny, and we’ve become good friends. Lately, I've been getting butterflies around him and feeling special when he’s nice to me. Tonight, after a long, stressful day, he drove me home and let me talk about my feelings. I feel terrible and guilty for falling for him, despite loving my boyfriend. I don't know what to do. Any advice would be much appreciated, as the guilt is overwhelming me.

I love my boyfriend, but I have a crush on someone else. Any advice?
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