I can't feel happy again.

I was very happy when my boyfriend proposed to me. We were really going well and there were absolutely no relationship problems. But recently he was offered a job in another state, and he wanted me to go with him. I couldn't, because my family lives here in Pennsylvania, and my mother really wants me to live near her. We agreed with him that he would go there alone, try to work at a new job, and that I would come to him. But recently my mother's dog got sick. And I had to take her to the vet every day. It was really difficult for me, because my mother and I love her very much. I completely forgot that I had to go to my husband and told him what happened later, when he got angry that I hadn't come. Then, when we made up and agreed on a new date for my arrival to him, our dog died. I was next to my mother, because she was very worried about this. I was also in a long depression, but I couldn't leave my mother. At first, my husband called me every day, then yelled at me that I had been depressed for too long and that he was not interested in talking to me when I was in this state. But I can't help myself because I have lost my best friend and my family member. A week later, my husband stopped calling, he also didn't answer my calls. He wrote that he was busy and couldn't speak, because he had a blockage at work. And when I came to him, deciding to surprise him, I saw him kissing his secretary at a new job. I decided for myself right away that I was filing for divorce in PA, because I wouldn't let him deceive me. He tried to catch up with me, explain that I didn't understand everything correctly, but it was too late. I myself took up the divorce and moved in with my mother. Six months have passed since this event, but I still don't feel joy. Even the things I once loved don't bring me the former pleasure.