Characters! (Pt 1)

My new au for SMG4.

AU description:

A soul usually cracks when a person in love, or rarely not in love, feels hopeless, envious, wrath, or even anxious. That bond, between the lovers of in rare cases best friends, starts to lose its form. Once that bond loses its form entirely, the bond will be destroyed. The soul of the person, who felt all of that, will break. These bonds can only be restored if there is enough love, romantic or rare cases platonic, between the two people, who once had the bond. Therefore, allowing the soul to slowly heal.

What would SMG4 do if his lover's soul broke?

Yes, somewhat dark, I know.