I'm dating a guy who is 29 years old and I'm 24. He got out of a 6 year relationship 5 months ago. We've been dating for a month now. He still communicates with his ex. He claims that he doesn't want her back because she cheated and put him through hell. He put a lot into the relationship. She wants him back, but he's waiting for her to prove that to him. We like each other, but I know for a fact he's not over his ex. I don't want to waste my time, so what should I do?