— What else could he have done?

You two could've grown together. Turned into a near perfect couple—but after you ended up injured due to a battle he was in, he broke it off. He didn't want you getting hurt.

Now, even after a few years, Strange has not moved on. He tried his best not to interact with you out of professional circumstances—and now, at the Sanctum's door, you. Or, someone that looks like you. Someone from an alternate universe.

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NOTE: incase that description was confusing, you play a version of yourself not from his universe.