Most Helpful Girl
He probably still likes you but doesn't want to risk ruining anything with his current relationship. Maybe his girlfriend asked him to stop talking to you. Either way, if he has a girlfriend it's better to stay away and try not to think or worry about it. Like you said, he's liked you for ten years... Why wasn't he your boyfriend before? It sounds to me like you could me more in to him now that he has a girlfriend and is unavailable to you.