Signature is a person's inner reaction at present, which can be a way of information transmission. One possibility for a person to change his signature frequently is that his thoughts and emotions fluctuate greatly these days, and he wants to express or vent his inner demands through his signature, so that others can see his current psychological state and meet his demand for attention to some extent. Another possibility is that he is sending a message to someone or a group of people and conveying his inner thoughts.

I want to know what kind of relationship you have with your ex-boyfriend, and how did you end it? The most direct understanding of blocking the signature is that he doesn't want you to see his inner changes now, or he doesn't want you to know the information he gave to others. He deliberately didn't let you see his signature, which means that he will still think of you in his heart. Maybe he still has feelings for you, and maybe he doesn't want you to see his current living condition or psychological changes. As for the specific situation, I don't know much about it here, so I can't make an absolute judgment. I hope the above answers are helpful to you! O(∩_∩)O