It's very rare that couples break up and there are no hard feelings on either side.
(usually negative)
So we're friends again, are we? No hard feelings?
hard feelings
Ill will, resentment, or anger Unfortunately these layoffs are out of our control. I hope there is no hard feelings.John's remarks after the ceremony caused a lot of hard feelings.
*hard feelings
Fig. feelings of resentment or anger. (*Typically: cause ~ have ~ give someone ∼.) The argument caused a lot of hard feelings, but finally we got over it.