The down side these days is thinking that, “I can do this all on my own”. Yes, you can do this on your own but you’ll be a much happier human being if you do it with other human beings.
Marriage is not a natural phenomenon. It is artificial, arbitrary. And when it disappears you cannot do anything to bring it back. You can pretend, but that pretension makes you a hypocrite. And your pretension cannot deceive the woman, because she has known your love and the pretension cannot become the substitute. The only way is to separate - in friendship, because you have given each other so much.