I love my best friend, who is dating my friend! What should I do? Grr...?

Okay, so, he told me when he was dating Jenn, that if he wasn't dating her he would totally date me....has not happened yet! I'm pissed! What should I do? He got mad at me for an email I sent him, telling him that I didn't want 2 be his friend anymore, but later I took it back! He's still mad at me for that, what shoulld I do?!!!!!1