Love is not just a state of mind.
Is it not?
It involves giving freely of oneself unconditionally for the benefit of others.
Self-sacrifice can be a byproduct of the state of mind of love, but the two are separate - one is an emotional/mental state, and the other is a characterisation of someone's behaviour.
Two profound examples:
Maximilian Maria Kolbe was a Polish Catholic priest who volunteered to die in place of a man named Franciszek Gajowniczek in the German death camp of Auschwitz.
Of every single person that stood up and put themselves on the many, many lines in all sorts of wars across the world and across history, there are innumerable examples of self-sacrifice for any number of reasons which you might characterise as, broadly, 'love' (whether for an individual, a state, a notion, a people...) across any number of philosophical positions, not just Christian or even religious.
And the second is the quote from John 10:18 where Jesus prophesies He will lay down His life of His own free will for the benefit of all mankind.
Given the fictional nature of the story, and the temporary nature of that sacrifice, and the fact that it was completely unnecessary, I'd say that's less profound an example than you think it is.
O.