Okay...... here is a hint.......
Your sister's marriage isn't your business. It's hers. You cannot tell her to get over him. If she wants to get a divorce, she will do it on her own time.
Stop giving him money. God only knows why you gave them money for their wedding - that's just silly. The fact YOU had to pay for HIS wedding should've been a hint in the first place.
file a divorce. She's better off if there is no love.