Is it worth telling him how I feel?

I was in love with my best friend in college. I’m pretty sure he felt the same way but we were both so timid that we remained only friends. Almost two years later, almost two years since I’ve seen him, and I feel this strong need to tell him how I felt/ feel. We live in different states; I don’t even want to be in a relationship with him, but I feel like I’m being dishonest with him every time we talk. I’m more confident now, and I want to be honest. I can’t fathom him dying without knowing how I felt, even if he doesn’t reciprocate. I’m thinking of writing him a letter. Should I? Does anyone have a similar story?