Truth no 5 speaks directly to me. And that is so correct about the person you love most being the one who hurts you most.

It will be a total misconception anyways to think that anyone whom you love will certainly be the one who hurts you most.
No
Better put "The person you love most, is the one whose hurt you feel most".

This is the logic: Anyone you truly love affects your hearts directly with every single act.

Therefore, when they hurt you, the pain comes so hard because of their already established position in your heart.