Memories With a Dose of Sorrow

It's such a weird feeling. I'm not even sure of what I feel - is it sadness? Is it pain? I feel like I have a hole right in the centre of my chest. A black, deep and scary hole. On our way back home, I could only think of him and his new partner. I could picture them together and I didn't feel envious... I think I felt numb. In a parallel world, if I had the choice, I know I would not want to be with him again. So what's all this sorrow about?