I just saw a woman I used to know prostituting herself on the street

I used to know this woman nearly twenty years ago. At the time she was in her thirties. I haven't seen her in years. Today I was driving home from getting groceries and decided to take a shortcut due to road construction down a street that used to be considered "the stroll". I didn't think it was still used as such then I saw a woman sitting on a bench and I instantly recognized her hair-curly and bright blonde. I knew it was the woman I used to know. She never liked me and was really nasty to me. Regardless, I felt horrible for her. She looked like a zombie, totally addicted and a street person. When I knew her she had just separated from a well-off man who she had two children with. She lived in a decent condo, took care of herself and was attractive. I couldn't believe this was the same person, I had to go back and check, maybe offer her some help. I circled the block and saw her walking so I pulled up in front of a car which was parked on the side of the road. In my rear view I saw her approach the car then get in. I turned around and slowed down and saw this white man in his fifties in the driver's seat. He was clearly looking to score some sex. The woman's eyes were sunken, she had large sores, she just looked like death. Completely emaciated. I felt so angry and shook I started tearing up as I drove away. What the fuck.