But FFVII never shows Cloud and Aerith together before the game even begins or give you any indication that it's one of the major plot points of the game like FFVIII does. FFVIII is literally about Squall learning to fall in love. It's not about beating Ultimecia. It's about Squall learning to fall in love.
And it's not as random as you make it sound, but that's not something I particularly care to argue right now!
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"The great GF...Bahamut."
"...GF? I...? Using my powers...It is you humans...I fear..."