I think the issue isn't the "wasted life" but rather how one measures their life.
If she was in a committed relationship, had offspring, a home with equity, savings, and a career, there is no guarantee that would bring her fulfillment.
And even if you had that fulfillment, there is no guarantee it lasts.
Life is hard, it's cruel and not at all fair. And the way to survive is learn that no matter how hard it hits, you have to keep moving forward. I feel for the author. I do.
I had "everything" going for me and in less than a year I found myself jobless, homeless, and prohibited from seeing my kids except for a few hours a day. Why? Because I finally stood up for us and called 9-1-1 on their mother for domestic violence.
I'll edit:
I'm now working on a new startup, loving every minute of it. I have a small apartment, and I have joint custody and parenting decisions with my kids. I'm getting help through a DV survivor group, making sure to prioritize my self care, and starting to date again. This struggle has brought me closer to friends, family, and to God, and has made me a better father. And it reminds me never to take for granted the things in life that I find joy in.