What should you do if you're in love with a man who is still in love with someone from his past?

Until they get on with their life you are wasting your time. to be honest with you, you need to talk to him and find out if he had the opportunity to be with her again would he and then you need to decide whether you want to stay in the relationship because if he feels that way then he may not have the same kind of love for you that he had for her and your constantly be at odds with each other because you want that the love he once for her so it's for you to decide whether to stay and try to win over his heart or move on. Good Luck!!