It most certainly is NOT a fact that because he is incapable of love, that somehow means you are not worthy of being loved. His failings and shortcomings are his alone.
Secondly, being alone should not be scary or lonely. You need to take some time to adjust to it, to learn to enjoy your own company again. The reason you are struggling with it, in part, is because you don't like you. You need to learn to like yourself again. And the way to do that is to start being kind to yourself.
Take a bubble bath, find a new hobby, go for a run. Enjoy your me-time and soon you will start to find that you enjoy your own company.
Thirdly, the anger is coming. And when it comes you may find it all consuming. Anger at him, anger at you, anger at the world. It will come and it will last. But when it comes it will also mean you are saved. It will be the beginning of you getting your strength back.
When it shows up and there are times you are feeling so angry you might burst,or you feel tempted to contact him, instead i totally recommend turning on some music and dance until you are exhausted, it really helps.
You will get through this.
I suggest also learning all you can about narcissists. To better help you understand...no,to better help you really feel, that none of this was your fault. Melanie tonia Evans does good YouTube videos.
You will feel better, have faith in yourself. And be kind to yourself.