Depends on what she does and security logging, etc. sometimes it's tied to the username. Especially true in hospitals.

Sounds like you're the sorry one

I, as a systems administrator, have changed usernames because issues similar to this one. It's not a big deal. Perhaps, the OP's company should outsource their IT department or fire a few people.

You can always change your password to "**** (his surname)" to try and make yourself feel better.

They can create a new adress for you and all the emails that are sent to the old adress can be redirected to the new one.

Use it as a reminder of what not to look for in a man. :)

Find a new boyfriend with the same surname as your ex fiancé and marry him.

What would possess someone to cheat on their fiance/e? I understand if it's a marriage where the thrill is gone and everyone's unhappy, or if it's a relationship that was evidently not going to work out. But why would you commit to someone for the rest of your life and THEN turn around and bang someone else? Just when you're supposed to start planning out your great future? People like this - not queer ones - should be the minority that is denied the right to marry.

Bad luck to use his last name before you get married. You should have known that.

Open a ticket! Im sure they can recreate your usernames in this unique circumstance!