It's challenging to determine the exact reason for the change in your ex's status on Telegram without further information. There are several possible explanations for this change:
Unblocking: One possibility is that your ex unblocked you on Telegram, which would allow them to see your status and messages again.
Reactivation: If your ex had previously deactivated or deleted their Telegram account and recently reactivated it, their status might change from "last seen long time ago" to "last seen recently."
Privacy settings: It's also possible that your ex adjusted their privacy settings on Telegram, making their last seen status visible to you again.
Mutual contacts: If you have mutual contacts on Telegram, they might be able to see your ex's status even if they haven't unblocked you.
App glitch: Sometimes, app glitches or technical issues can cause inconsistencies in last seen statuses or other information displayed on messaging platforms.
To know for sure what happened, you could try sending your ex a message on Telegram. If you were blocked before, your messages would not be delivered, and you might still see the "last seen long time ago" status. However, if your messages get delivered or read, it's likely that your ex unblocked you.
In any case, it's essential to respect your ex's boundaries and privacy. If they chose to block you previously, it's best to avoid excessive or intrusive attempts to reach out. If they want to reconnect, they will likely do so on their own terms. Focus on your well-being and moving forward, regardless of the changes in their Telegram status.