Secretly Falling for Another

So I have this co-worker that has this crush on me. Problem is that I'm in a relationship. Everyone tells me that I should be with him and dump my current boyfriend. And the thing is: I'm starting to believe them. I see him differently now. I am beginning to have a tiny crush on him. This minuscule feeling that grows every time I see him. My current boyfriend and I are somewhat distant but he still texts me everyday to see how I am doing. But I don't know if I want to be with him anymore. I'm lost and conflicted. Any advice??