The salient issue here is following the league rules. That's what allows an owner to also be the commish and avoid perception of abuse.
If the trade was completed and survived veto, then it's done.
If you offered to revisit a veto after the fact and even voted his way, then you've gone above and beyond the call as both commish and owner.
Don't worry about bruised feelings. If anyone comes back to you on this, refer them to the league rules. Unless there's something in there you haven't shared.
I want to die peacefully in my sleep, like my grandfather.
Not screaming, like the passengers in his car.