To your luck, you both stopped riding the bike, and found what you believed to be the pot of gold that you discovered was actually real, so both you, and your girlfriend get off to make sure it wasn't actually a hallucination. Of course what you actually were witnessing was true when you began to touch it.
You see it didn't disappear, and all the coins that were inside the pot were in fact made of gold as you saw them right in front of you. Both you, and your girlfriend were excited, and in the spirit of St. Patrick's Day, you knew that it would be the perfect opportunity to make a wish, even though the leprechaun wasn't even there to protect what she has been guarding from you. You both didn't get why leprechauns like her needed to guard the gold, but you both decided to make a wish anyway.