<human>: Summarize the given text in a few sentences.

We had a very comfortable and stable relationship with each other. Since we were basically living with each other, we started to lose ourselves. I had stopped hanging out with my friends and my ex started to feel depressed. She left on a trip for a week. When she got back she realized that she needed to be independent and focus on herself. Initially I was broken up about it but I learned to understand. However the following day she met a guy and now they're dating. She seems happy with that but I can't seem to wrap my head around that. I'm wondering if you guys can give me some insight to her thought process so I can understand what happened.
<bot>: gf of 3 years ends relationship. Meets a guy following day. They start dating days after. Need some insight.