My ex sent me a short message asking me to take good care of myself.

I'm glad to answer this question for you. My personal views and suggestions on you are as follows. First of all, you describe calling her after breaking up, but she doesn't answer, and he will send you a message to take care of yourself. Don't stay up late to read your description of the problem. First of all, he didn't answer your phone because he didn't think it was necessary for two people to communicate and overlap. Then it's good for you to send a message to let you take care of yourself. A kind of care, but this kind of care is different from the original care, because you two are no longer together, he can't take care of you, so he can only send a message to let you take good care of yourself and ensure your health.