Yes, the love that most people talk about is a chemical reaction in the brain, what they should more properly call "infatuation." It fades, can't possibly last forever, and then they're left resentful and seeking the high again, often blaming its loss on the other person.
Love, like you say, is a choice; the choice to shield even in anger, the choice to be kind even in pain, the choice to be naked even in shame. It is the desire, not for another person, but for their wellbeing, sometimes at the cost of your own...and as long as you continue to choose, it can be undone by no force in existence.
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Damn sir, those words were better than mine!