I spent many evening hours working, and did not foster the relationship. I stayed up late at night, she was going to bed alone. Even good relationships need constant work.
Secondly, I think working for myself somewhat transitioned me from "boy to man" so to speak, not in a good way. I became less inherently trusting of other people, and sometimes the stress wore on me and I became distant.
It's probably quite common. This is the part of Elon Musk's story which people rarely mention. Divorce is a high cost for any business, and I'm sorry you went through it.
I've read it takes a couple hours a day to maintain the feeling of romantic love in a relationship (according to Willard F. Harley). If you're in love this is pleasurable time spent rather than constant work, but it's really easy to let other stuff get in the way.
