Does he know about her feelings for him? Does he reciprocate them? I think those are the key points. If it's a yes and a no, then he isn't worth pursuing, in my book. I'd cut the ties with him and try to get over him ASAP. It's been a year. It took me a year to get over somebody (an ISTJ) and the only way I achieved it was coming to the conclusion that things weren't going to happen my way, so I found someone else.
Then again, I'm the opposite of his type. Plus, Pi logic is a stubborn mule.