Why people are so afraid to be single?

I was having a friend in the past. She was a co-worker and became one of my friends. They were working with her man in the same company, being together and seeing each other every day. Their relationship was long, probably few years. She didn't seem like loving him as a man already, she looked like she loves him as a good friend and a person she could trust on for whatever. He asked if she wants them to get married. She accepted it and we spoke a lot about it. She didn't felt like it will bring her lots of happiness if she marry him, but still said "I prefer I to be the one who is loved more, than to be the one who will love move and forgive all the time". They get married. I remember her, she was very excited, planned her wedding herself and it was a great moment. Then she moved on another job and they were already working in different companies. On the new place she became something like ... a person responsible for the money and the stocks in the shop, something like manager. The work was so great for her, she could express all of her beauty and flirt with every single client. She started to cheat this guy. She was going out late at the evening, visiting parties, going our with her friends. And her marriage became a boring thing for her. They moved in their own flat with her husband, he wanted kids, she didn't wanted kids. He asked a divorce after catching her where she goes. She signed the papers about being divorced. Her man moved out of her flat and found another girl, she was dating some younger boy, but wasn't that happy. Her ex husband is having a kid now, as I know. When my friend understood about it she started crying how she would have a great family, but she wasn't able to take the right decisions. Well she moved out of her flat, because living alone she couldn't afford paying her expenses. We spoke after that and I told her it will be a great moment for her to start moving on, move again in her own flat and start living properly after this bad experience. It could help her much more if she knew what she wanted. But no, she didn't want to live alone, it was making her depressed to get back in the empty flat. Now I am asking myself how I would do if it was me in her shoes. It's not like I don't have feelings, but I would do much different. If once the mistake was made and I lost my husband, I would try to move on. To continue working and to pay my bills and live alone, til I find the person I would like to meet. If I was having my own place I would be so happy about it, I would never quit it because of any reason. Having a place is such a freedom here in my country where we work to pay our rent and only our bills, little part of what we earn stays for ourselves and we usually put it for food and other needs for living. I know it's a long first post, but I would be glad to know what you think about it.