There can be a variety of reasons why a guy doesn't respond after receiving a breakup message, and here are some possible explanations:
1.*Takes time to process**: Receiving a breakup message can be shocking, sad, or confusing for a guy, and he may need time to process his emotions and think about how to respond.
2.*Don't know how to respond**: Guys may not know what to say or worry that saying the wrong thing will make the situation worse.
3.*Hope to calm down**: He may want to calm down and avoid impulsive responses in emotional situations.
4.*Default breakup**: The guy may think that not replying to messages means that he has defaulted to the breakup, or he may have decided to accept the breakup.
5.*Avoid conflict**: If the reason for the breakup is complex or conflicting, he may not want to cause more conflict by replying to the message.
6.*Fear of getting hurt**: Not replying to messages can be a way to protect yourself from being hurt again in a communication.
7.*Want to retain dignity**: Boys may feel that replying to messages will make them appear too humble or begging, so they choose not to respond.
8.*Laid Down**: He may have accepted the fact of the breakup and deep down has let go of the relationship.
Of course, the above are only some possible reasons, and the specific situation needs to be comprehensively judged according to the boy's personality, getting along experience and the reason for the breakup. If you're concerned about the other person's situation, try communicating with him in other ways or give him some time and space. Most importantly, respect the other person's decisions and feelings.