I need help understanding what’s going on.

So I was selling my Fortnite account on an alternate email as OGE can’t be sold as it has all my banks and important documents. He somehow found all my emails that were connected to my epic account and tried to Brute force and I kept getting emails sent to my email address that said, “to: austinstr.eet73+160@googlemail.com” which is similar to mine but ISNT mine so no idea why I was getting all those 2FA confirmation codes.