1. Rational analysis: Don't over-interpret this event. Since the other party doesn't want to add your WeChat, it may be just because of personal preference or other reasons, not necessarily your problem. So keep calm and analyze, don't blame yourself and don't take things too seriously.
2. You didn't give up: You chose to quit because you respected each other's wishes, so you should give yourself affirmation. No one can force others to do what they don't want to do. The other party's unwillingness to add WeChat is a kind of protection for yourself, and your choice is also a kind of self-protection.
I have always hoped that although it seems impossible to establish a deeper relationship at present, you should not give up looking for other suitable opportunities. I believe that in the future, you may still meet someone you really like.
Finally, no matter what happens, it is important to stick to yourself and believe in your choice. Please face life positively and enjoy every day.