I like this guy I met about a month ago at a friend's house. The problem is he's still in love with his ex that broke up with him a few months ago. They dated for several years, so I understand. He has said he asked her to either completely say goodbye (as she said she was confused when they broke up) or take him back. She refuses to do either. He told me that until she does one or the other he can't even try to move on, as he doesn't want to hate her for not giving him closure. He said he knows that if he stopped calling he'd probably never see or hear from her again, but that he can't end it like that.
But he DOES flirt with me. He told me the other day that he trusts me a lot, or he wouldn't have told me the above mentioned facts. He's usually very private. Should I continue to be friends with him? I don't want to get attached to someone that can't let go of someone else. And if I do like how long should I wait before letting him know I'm interested. 'Cause I promise he's clueless to it right now. Poor boy is so innocent.