Yeah I don't think we share the same definition of love. The exclusive love that you're talking about feels more like attachment.
When you're no longer attached to someone, when you no longer need them to fill a void within, it is easy to let them go.
In most cases people jump from 1 attachment to the next. The other person doesn't complete them as much as they initially thought & so they hop to the next person seeking fulfillment.
True love can only be experienced when you yourself feel whole. When you don't need the other person to feel complete.
One of the hardest things was letting go my dream of achieving enlightenment once I became a father. I knew that I will always have attachment to them. I accepted it & loved them fully & unconditionally as best I could. I want them to experience the fullness of whatever purpose it is that they came here to fulfill. I know that they occasionally need to experience the pain & discomfort of their own decisions & actions. That ultimately their comfort is neither my concern or responsibilty.
I'm only just now starting to feel my attachment to them dissolving. The love is still there but my need for them to be a certain way is softening. I'm only now learning to love myself unconditionally.