For people pitying over Harry, guys Harry is a weak beta.
No normal sane person will tolerate being cucked, he will retaliate one way or another. Retaliation may or may not take time based upon the way he retaliates.
As you can never be a God, to defeat demon you need to become a greater demon, something along the lines.
Sometimes you defeat evil with ultimate good, OR you defeat evil with GREATER EVIL.
It's normal to lose all hope and sanity temporarily when you found out your loved ones cheating, but what doesn't kills you makes you stronger.
Luca clearly has a weak spot for his mother, power and position. Yeah he might not have weak spots for gals unlike most men.
But without power, position, money AND his mom stolen, what do you think this shit is gonna do?
As I said sometimes you need a greater evil to decimate the evil.
This can be another hell of a game, another story where Harry makes a explosive come back.
In which it'll be Luca who narrates the whole story that how he himself became the ultimate sole reason for his own complete downfall.
That'll be another hell of NTR story, but I don't think HC has any plans for that.