It is a strange dis-ease, when you get another pet while grieving the last one. The ease of being with the one you loved and were so familiar with, combined with the new challenges of training and getting to know the new one can be complex. Your previous pet taught you how to love even more than you ever did before, so please honor them by using what we have taught you... to love again.
There are many many pets who have been rescued -- or are not rescued yet but need to be -- who are just waiting to be loved.
You will find that if you take the chance again, they ultimately help you to learn to love again, this time in a different way.