If your ex blocks and deletes everything from their Instagram after breaking up with you, it's unlikely that they will directly tell you why they're doing so. Blocking and deleting everything can be a way for them to create some distance and emotional space after the breakup.
In many cases, people choose to do this to cope with the emotional aftermath of a breakup or to prevent further communication that may prolong the healing process. It can also be a way to avoid seeing updates or posts related to the relationship, which might be painful for them.
If your ex wants to communicate their reasons for blocking and deleting you from their Instagram, they may choose to do so, but it's not guaranteed. They might prefer to keep their reasons private or may not want to engage in further discussions about the breakup.
It's essential to respect their decision and give them the space they need. Focus on your own healing and well-being during this time. If you're looking for closure or understanding, consider seeking support from friends, family, or a therapist who can help you process your emotions and move forward.