What is your ex's psychology of not blackmailing you but not replying to you?

Your predecessor didn't pull the strings, but he didn't return your messages. It may be because she/he needs time to deal with old emotional or personal problems, or it may be because she/he doesn't want to break the connection between you, but she/he doesn't want to develop a love relationship or can't respond to your emotional needs. In this case, she/he may keep his/her distance and avoid any behavior that may lead to misunderstanding or false expectations. In addition, she/he may also want to keep friends, but she has no energy to keep in touch with you at present. Another possibility is that she/he may think that you still have feelings for her/him, but you don't. If you reply to your message at this time, you may mistakenly think that she/he is interesting, which may lead to new contradictions.

In short, in this case, you need to respect your predecessor's decision and her/his feelings, don't give her/him pressure or do anything that might make her/him uncomfortable, keep a certain distance, and respect each other's choices and personal space.