To be fair, the Oathbreaker knight exists in the first place because he agrees with you that sometimes oaths just have to be broken.
Now, there is a way around it, sort of. Ancients can't make a deal with Ethel either, but as long as literally anyone else in my party talked to Ethel, my oath was fine. Same with giving Mayrina back her zombie husband. Ancients objects...but as long as I talk to her with not my avatar, it's fine.
The Oaths only care about things you do personally. If your friend does it, not your problem.
