From what I've seen, they are happier and healthier.
I had 2 marriages, now single for good.
The constant pressure of always having to bring my A game, centering a man, constantly having to be entertaining, funny and keep a happy face for the other person, I found that it’s just too draining and at the end of the day I felt empty and tired.
Being single now makes me feel alive, free, and full of energy. You can really find the things you want from a relationship in yourself.