Ending a relationship is not always easy especially if it’s the other partner who decided they wanted out and not you. Don’t follow them around try to get them back into the relatioship. Spending time on the phone trying to get them to see things from your point of view wont help either.
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I am not advising you to stop talking to the person, You need to put yourself out of the picture for a while to avoid making the situation worse.If you are going to call the person avoid talking about the relationship, talk about other things approach the whole thing from an angle of friendship. If your partner was just going through a phase it should wear off.
If however the relationship is beyond saving then do not waste time on it . There are still other people out there who care about you. You still have your friends and family there for you. Just give yourself time and focus on moving on.
At this point advice streams in like spend time with other people, hang out and so on. Yes this does help until of course that odd moment when you are alone and your mind wonders off back to the past. So besides spending time with other people you should think about the things that you enjoy doing on your own.
Even if you think it doesn’t count for much, if it gives you quality you time then its good. Some people are active they play sport or enjoy the outdoors life; others are more indoor movies, music, books, cooking. being alone should not be a problem for you even if it means spending hours staring at your computer. Apart from these simple ideas you can find sites that discuss this subject in detail, broken down and made so simple you wont have a problem dealing with your current stress and move on qiuckly.