I don’t think I can wait for his divorce

I am a 30-year old woman in a relationship with a married man. He separated from his wife two years ago, but she hasn’t granted him a divorce yet. He wants one and knows she is refusing to give it to him because she knows about us. I sympathise with him, but don’t know where this leaves me because I can’t keep waiting for him to formally commit to this relationship. I feel bad because I know it’s not his fault, but I also have my own future to think about. He wants me to give him more time, but I have already waited a year-and-a-half and can’t even tell my parents about him because of his situation. Should I wait for a while longer like he wants me to or give up now and hope to find someone else?
This depends entirely upon how you feel for him, and what the legal implications are. He is still married, which makes this tricky, and only a lawyer can comment upon what a legal separation implies. If his wife isn’t granting him a divorce, there may still be options open to him if he chooses to find out what they are. Waiting for him or not depends upon how much time you believe you are willing to give him. If you are willing to let go because you don’t think this relationship has a future, the sooner you end it, the better. Tell him how you feel and allow him time to come up with a plan or decision that can help you both.

How do I convince my mother to let me go out with a girl she hates? She thinks her family is awful, but she’s wrong.
You can give her reasons for why you believe she’s wrong and ask her to consider meeting the girl before imposing her rules or opinions on this relationship. She has your interests at heart, obviously, but probably doesn’t have access to all relevant points of view.