He said that he broke up with me and hadn't contacted me for two days. Today, he asked me to have a happy holiday. Should I ask him back for information?

It varies from person to person, but we can be friends after breaking up. But it's hard to be friends, even friends may just be ordinary friends, because after separation, they will have their own lives and partners, and it's good to break up, very good. If you have loved each other deeply, at least one of you will feel deeply hurt. He may send you a message because he won't forget you for a while and wants to be your friend! It seems that after breaking up, it is necessary to understand the reasons for breaking up in order to learn a lesson or recover as soon as possible in the following time. When everyone can face the past together, I think friends are enough and time can heal.