Exactly! And he'd be like "she's all famous now, she probably doesn't even remember me", then she'd sing him some song as a message and he'd have to barricade himself in his apartment/dorm/under his bed to hide from reporters, angry fanboys and Zack. And Zack would be really sympathetic, but only for 15 minutes a time.
And damn, if they had already met each other and been all underage-coupleish, and she said "my boyfriend Cloud Strife" on TV, he'd be so dooooooooomed. And so very envied. Zack'd be all HOW COULD YOU NOT TELL ME YOU SCORED WITH THE MOST WANTED BABY OF THE YEAR, and would probably need bodyguards to walk around.
Then again, Tifa could just tease him mercilessly on TV. "Oh, yeah, my unrevealed boyfriend is the cutest ever, but can't cook to save his life. The other day he put some water to boil and suddenly the pan just caught fire..." and fanboys everywhere would be writing every single clue down to find who this bastard was. BUT THEY'D NEVER CONSIDER CLOUD because Cloud's so small and not-impressive.
And she'd totally be her own bodyguard Because the first bodyguard she had was a fanboy who she'd ended up having to guard herself from. You know, crazed hormonal fanboy with bodyguard fantasies.