Feelin really depressed & worried over work colleague. plse help?

Honestly, I think you DO fancy him. He seems to be giving you mixed signals. I'm assuming you guys are over 20, so at that age, he should be mature enough to know what he wants. I don't think you are what he wants- YET. Dont act desperate, let him come to you. And if not, he doesnt deserve you. PLenty more fish in the sea.