Love IS a chemical reaction, but that doesn't make it meaningless, or at least any more meaningless than any other human emotion. It's because some hold it to unrealistic expectations that people feel the need to demote it to a "meaningless" chemical reaction to knock it down to size.
Love can't be too conditional or it becomes a blame game, yet too much unconditional love is codependence. Hence, you can hold someone accountable for their actions and still love them, in fact, this is a truthful and beneficial form of love. Love is a verb, and normally an exercise in thought rather than profit. It's an exercise in trust, loyalty, fidelity, gratitude, and ultimately nostalgia or regret. Lust, or obsession, is the want to find a partner who will satisfy and do good for you, but love is the want to find a partner you can do good for and ultimately benefit.
A good partner will not demand the behavior the want in you, but naturally bring out the good side of you, and vice versa. The similar euphemism that applies to friendships, that they are established subconsciously and not by force, is somewhat applicable to love that works.