Crush on straight friend....

It all started with him getting moved to my department at work...we worked together for 3 months...for those 3 months we developed very good chemistry working as a team...he's been the only person I've come out as gay to. He was very supportive and accepted me. We even joke about it.He's 25 I'm 28, he's very attractive and combine that with his awesome personality and yeah you know the rest...He quit work last week since he's moving out of state but we vowed to keep in touch and we have been..went and got some drinks yesterday...But these feelings are just down right crippling.. The jealousy whenever he talks to women., the restlessness, wondering what he's doing..etc...Should I go ahead and just tell him my feelings?