It changes little that Anakin was made to forget what future he was shown on Mortis. What really matters is that given the same conditions, the same kind of foresight of a future disaster, he would fall again (and he did).
It wasn't love that made Anakin fall. And it isn't love that leads to the so called dark side, however some Jedi preached (which Qui-Gon insightfully disagreed). Anakin did not know love, at least not fully. What he knew was possession. His desire to keep whom he held dear alive was in essence out of a selfish starting point - to save himself the pain of loss. It matters not that he would sacrifice his own life for them - it is not selfless either; in fact, in his heroic arrogance (or maybe not that bad as "arrogance"?) he had not given a thought to what suffering such sacrifice would induce on whom he left behind. True love is selfless; true love is to let go, to set free - just like Luke's love for him.
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