Though it is difficult to be back living a life as a single person once you had been in a long term relationship. But once you decide that living life without your partner is the only option, you can really think of ways to live life with complete ease. One of the first thing you need to do is to remind yourself again and again that there is no one to attend to your needs and requirements like before. You need to do things on your own from now.
Everything will become easy once you will understand that you have no other option to become self dependent and responsible. Half of the things will become easy once you start doing things and handle situations without depending on others. Though it is not easy but there is no harm giving it a try.
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Thus, all you need to accept that things have changed and now you need to life for your own sake and for yourself.