Ask him what's going on. But it could just be that you two will be better friends then a couple.
He should be able to give you a straight answer to whatever you ask him if you guys are that close.

 "Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone."

"...I don't like people who talk too much about how everything they do is for the sake of others. It's not true." 

"
The question isn't who is going to let me; it's who is going to stop me?"

     - Ayn Rand