Life without him does not need to be sad or lonely. Sure it’s normal to feel sad due to divorce but it shall pass. It helps to make changes in your routine too. Yeah going to places you frequented with him by yourself might reenforce lonely feeling. Well then don’t. Go do different things. If listening to bands by yourself saddens you then do other things. Divorce or break up is hard no matter how long you’ve been together. It’s normal. Do uplifting things and stay busy. Don’t do stuff that makes you feel worse

Also sometimes active/creative hobbies are better fit your mental health than passive ones. Passive is going sit and listen, while feeling depressed. Active hobby would be join a choir or a band. Passive is watching sport while feeling lonely. Active is join a league or a group at community center. You won’t be thinking about him as your mind and body will be occupied