what would you do if it's a person you were interested in who knows your ex? You dream about them, masturbate and visualize their face...how would you approach them...or is it worth it?
Approach the person in a social setting at first, try to talk to them as much as possible. Once she/he gets to know you better you should drop hints that you like them. From there I think it should succeed or fail naturally and at least you'll have given it a shot. It's definitely worth trying for if you are so into them; if you don't try, you may regret it.