Inlove with my bff

I'm not sure what to do, I was friends with a guy through out high school. We were super close and he was madly inlove with me but I always had a bf and look at him strictly as a best friend, til one day we got super close. I kissed him and from there confusion started. I am now 26 and haven't seen this friend for about four years until recently. Now I can't stop thinking about him. Not sure if it's crazy to tell him how  I feel because it's been so long or I should just put myself out there ?