16 years of marriage, what do I do....?

My husband of 16 years is a fixer. I am helplessly in love with him but he develops relationships with other women and ends up having feelings for them. They are always troubled women with bad past experiences. Most of it has been on the internet, however, his latest was his boss. He has told me about it every time and each time he moves out only to realize he wants to work it out with me. When we got together I was troubled but over the years have become strong and independent, have a good job and can support myself. He has agreed to go to counseling for himself but for me I feel like I am just done with this relationship but keep having moments where I try to rationalize why he and I should try and work it out. He is my husband, I did take vows for better or worse but feel I just can't keep going through this again and again. He told me that while I was in school that he detached from me and although he has moments where he feels he is in love with me he feels most of the time that I am just his best friend that he loves deeply. I'm looking for insight other than my own and perhaps a new way to look at things. We also have a child who will going away to college soon so i will be in this big house all alone and the future I had planned for just me and my husband is now gone. I know he has a problem and needs counseling but its not going to be a quick fix for him and if we are apart too long I think we will both move on. I am just so in love with this guy but he can't be trusted and each time he does this he chips away at me. I don't want to be his fool any longer but his ghost is everywhere in this house. Thank you for your time.