It really depends, are you talking about in the movie or in actual real life? I'm not so sure but I'll answer both for you.
In HSM: Gabriella met Troy when they sang together at the New Years Eve party.
Real Life: Vanessa met Zac in the auditions when they were paired up for the auditions.
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Troy at last actually marries Gabriella. Gabriella gets a baby and Troy one day starts to chew on her velvet and they kiss. Troy soon acts like a baby chewing her milk. Troy later chews on Gabriella's velvet forever when they were naked. Soon,Sharpey marries Ryan. Gabriella was embaressed. Troy however was still chewing on her velvet. This went on for 8 years. Their baby, does not learn anything. Troy still chews Gabriella's velvet.
Gabriella Montez
No but she does have a boyfriend (which is Troy Boltan )
No, he is dating Gabriella Montez.
Yes! They already did in real life and in the movie.