Why are some boys so cruel?

They haven't moved on from their previous one sided love or ex, still miss her everyday BUT have the audacity to also see other girls and we end up getting hurt after we find out how he is still missing his past lover.

They lie to us that they've forgotten her and moved on, then they talk to us, give us special attention.
But we catch them missing her again.


WHY DO THESE GUYS DO THIS?
I swear karma should treat them even worse in future.
Why are some boys so cruel?
Post Opinion