If he is in any type of relationship why bother them. Realize that however they are functioning it is working for them and you are now where in the equation. Isnt there anyone else you have had your eyes on or have eyes on you. Why is he an ex anyway, if you belonged together you would be together and you wouldn't have to work this hard to get him at all. If you really want to try then be a big girl and go and ask him if he's still interested and don't play games. You'll find out rather quickly if you should waste your time on him or invest it with someone else.