HoW Do u kNow

oh wow well maybe you need to take a break so he can figure out who he wants to be with because simply and obviously he cant have both so give him time to make up his mind

talk to him, explain that even tho u know he has a right ti cherish what hehad with his ex he cant go on lovng the both of u....tell him ur not guna wait around for ever a years gone and nothing...tell him ull give him sum space to let him think bout what he wants but u wont be strung along anymore. if not this guy isnt worth it as hes obviously stuck with his ex and u deserve the whole fo sumones heart.
xxxLoUxxx

the muffin man? He lives on Dreary lane.

Well then..
You might have to make a few demands. You can't have him running around telling his ex that, it could spark old feelings and lead to him cheating on YOU.. :o
Slowly minimize communication between them. If things get dirty, you might have to do an ultimatum - her or you.