Lock Fortnite account?

A buddy of mine gave me his accound because he could not play anymore. Since I've already reininwestiert more money in the accound he is mine then.

If he says something and I with a counterpart nerve him he threatens to lock my accound.

Can he do that?

What can I do?

He can change the password, then you can't get in anymore

1. It is NOT your account.

2. Yes, if he writes that to support, they can block the account. Legally you should not have a chance. You may also block "your" account without giving reasons