How do I know I am ready for a new relationship?

When you are happy for the other people you have been in a previous relationship with and the way their lives are going. You are happy with yourself and how your life is progressing and you realize that you don't need someone else to make you happy. That you are just fine on your own. You have been thriving by yourself and know that even if you get into a relationship with somebody else it will be to benefit them and not because you need a crutch for yourself. You know that you're okay by yourself and you want to share that happiness with someone else.