Japan's handsome 35-year-old uncle became a tramp. What has he experienced during this period?

My uncle is handsome and has a stable job. He used to be a nurse, but at the age of 30, he met a single mother. He was a single child, which made him hum a little. Later, they lived together. As a result, the woman was pregnant with his child but didn't want to have it, making him feel that he was just a tool for their survival. So he left home.