Sometimes, it happens when you are not in the mood and deletes your telegram messages. But there is no need to worry about it. Because you can recover your telegram messages after deleting them. All you need to do is:
Login to your telegram account and then click on the settings
After then, you will see the “Advance” option, simply click on it.
And finally at the bottom “Export telegram data” option will appear, click on it and recover all your deleted telegram messages.