Rage and hate

I was with him for 8 years. We had different life goals and showed love in different ways. I understood his reason for breaking up with me. I did. But he moved on so fast. We still own a house together and I was dropping off my dog for him to watch while I was away and her stuff is there. Her toothbrush in my cup. Her tampons in my drawer. I’ve never felt so betrayed and angry in my life. I understand the split and his need to move on. But why did it have to be so fast and why couldn’t he wait until the house was sold and we never had to see each other again. It’s such a slap in my face. I’ve only been moved out three weeks.