He will do this with your current girlfriend, ex-girlfriends, or long time female friends.
Ways to figure if your friend is Face Leech:
1. Hang out with him at a bar till you accidentally bump in to a female friend. Next morning, check to see if they are friends on Facebook. If they are friends and you seemed to have missed the conversation about them being friends on Facebook... Your friend is probably a Face Leech.
2. Look in your mutual friends with him. If its all girls and just another guy or two... He's most likely a Face Leech.
Angela: So she's faceleeching you!
Ivan: Why faceleeching?
Angela: Cause she's draining all your energy when you ignore her requests!