Marriage and Betrayal, possible to rekindle?

Currently, my husband and I have been separated for 6 months. He has betrayed me very badly and has left a terrible scar on my heart. He consistently lied throughout our marriage and cheated prior to our marriage, and there is suspicion that he has cheated during our 3 year marriage. Now, I believe in marriage and I know I have made a vow but I don't believe living in a lie or betrayal. Now he is trying to win me back, but it is hard because I tried for a year to get him to do counseling and now he says he has changed, and misses me. I am honestly doing better now. Even though I do get lonely, but somehow I know I am better off without him. We don't have any children. To be honest, I lost respect and trust with him. His communication was horrible and now he says he is changed...I don't completely buy it, but I love him. I went back once after he cheated and still had insecurities, despite that I married him, but now he has lost all my respect...how can you heal from a bad wound?