I am terribly sorry that you are hurting, and I hope you continue to take care of yourself. I have never felt lonely or even grieved/mourned the loss of a relationship, so I have no helpful tips for those things. The only thing I can suggest is getting out and meeting some new friends and spending time with loved ones. You need a distraction to not dwell on the break-up. In due time, you will start to believe that it was for the best. Right now, it hurts, but as with anything it will get better. Take care of yourself and spend some time alone, too. Do some things you like to do or have been meaning to do but never had the chance to. Sending hugs your way.