What helped me was starting some stuff with friends, dating some women and focusing on myself. Getting back in shape, working out. Even work helped a lot. Its okay to suffer and feel down, but only for some time. Don't get dragged down into some permanent depressive mood. Focus on living and enjoying life for yourself. Try to be happy and do things that make you happy. Its been 8 thrown away years back then for me. Dunno if this counts as long term for you, but for me it does. Now I am married and have two healthy and beautiful children and all I can say is that it was somehow meant to come this way. These 8 years and the end of this era belong to the path that lead me to where I am and although it was hard, its okay now. You deserve to be happy again and you will be happy again. Don't make your wellbeing dependent on a partnership you just lost. Just do stuff with your friends and find new friends along the way. Hope this makes sense