I sent a text message to my ex-boyfriend who broke up for a year, and he replied to me quickly. What does this mean? What should I do if I want to make up?

It just means you still have feelings for him. Don't speculate on each other's feelings and moods. It's easy to be wishful thinking.

Yes, the meaning of the same action is different for different people. What does this mean?

It is up to you to chat slowly, text messages, etc. to infer and judge, and the rest is best and straightest.

What is effective is to explain the problem clearly and see what is going on clearly, so that you don't have to be in a dilemma.

Friend, I wish you happiness ~