As a matter of course, your child will someday confront you, making it known that they resent you for being emotionally neglectful. Stay calm and nip it in the bud.
Treat this little face-off as an opportunity to teach your child that any attempt to gain closure is a dead end. Completely invalidate their feelings.
The best way to do that is to stay quiet. Don’t even dignify their accusation with words. Just shrug your shoulders while the look on your face says “And?”.