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