Should I act on my impulse?

Long story, but there’s this guy…who I am in love with. We’re not together or anything, but I’ve been in love with him for years…3 or 4 to be exact. If you read my other question, I named him as ‘Mr X’. I am newly single and so is he, and I have this overwhelming desperation to tell him how I feel. He once told me that he loved me too, but that was a year ago. The universe has been cruel and seems to want us to be apart instead of together, as we’ve always had someone else when the other didn’t. But it’s always been him…

Now, here’s what I don’t get…he’s with someone else who is engaged to someone else?!?! I don’t understand it. I know I can make him the happiest man in the world and he’s wasting his time with someone who is engaged, and 8 years his senior. I’m only 21 and he’s only 20, but I just know I love him. I’ve known it ever since school. We’ve not spoken in ages and it seems he’s not interested in me anymore, which is weird because everyone has always known that we were mad for each other without ever being together. I kissed him once last year for the first time, and it was the best kiss I’ve ever had. What should I do? Should I just tell him how I feel and get it out, with the risk of being embarassed and let down…or should I just forget him.

Problem is I cant. Love stinks.