She had been depressed and drifting away for a long time – she broke up with her other partner first, then a while later with me. She wanted a monogamous relationship, but I think wasn’t honest with herself about that for the last couple years of our relationship.
I’m still with my other long term partner, and she is engaged now to a guy who seems great and supportive. I miss her, but I love her and want her to be happy, so I’m glad she’s found what she wants.
I always thought the same thing! I only found this out relatively recently, and I thought it was pretty cool