... well, that is up to them. But if they go back and neither remembers, would they consider it a marriage?

Either way...

The only person who can give you answers is your uncle. Who will probably try to find you, sooner or later.

... sooner.

[ Listen, he's witnessed sect leader Jiang yelling at Jin Ling for taking off without warning. Even if for this young sect leader Jiang, Jin Ling is a novelty, he strongly suspects it will be very similar. Maybe with less yelling but not with less emotion. ]