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Is forgiving someone who doesn't regret beneficial for you?
It is not possible to really forgive without repentance.
Forgiving without repentance is premature; it is a disruption of an organic process of admitting a sin, repentance, making amends and then being forgiven.
We forgive because we see the deed as a mistake, a mishap, something out of character. Forgiveness cannot apply to things that are an integral part of someone, something the perpetrator sees as right, as there is no redeeming background (in the person) against which the deed happened.