pain is love symblizes the struggle of love and is meaning that to truly have love you must go through pain so therefore they are one in the same

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.

Tying together relationship between the two strongest emotions, pain and love. Religiously, christ suffering and being crucified symbolizes the pain he went through because of his love for all manking and dying to free mankind of their sins. Also, shown with parents, children. A mother is willing to endure a significant amount pain, even death because of her love towards her newborn. "Pain is love"..
many other examples of this..