I recently split up with my partner of 3 years because of how I was treated and because there were times when he went behind my back to talk to other girls and send pictures. I completely understand that our relationship was toxic and bad for both of us but on the other hand we had some amazing moments. He's left my house but I'm just looking across from me and seeing that he's not there hurts and knowing that he won't come back from work and slump on the sofa hurts me too.. I'm sad and I want to be able to get over this but it's just I can't get those nice times out of my head and remember why I am doing this.

Any advice? Thank you