It is believed that Aerith did know, which is why she looked up towards the sky in Crisis Core and why she became close to Cloud in VII since Cloud had Zack's memories. So, yes, probably.
In the FMV of Crisis Core you see Aerith almost KNOW he dies. Watch it on YouTube You'll get what I mean
No. Cloud and Aerith never became a couple. It has never even been stated Cloud held romantic love for Aerith.
Zack falls into the church that Aerith is tending to her flower beds. Injured she aids him and when he awakens he mistakes her for an angel. She tells him she is not and he ask her out on a date as repayment for her kindness. Zack falls in love with Aerith.
aerith loves Zack fair. but when Zack died, she replaced him with cloud strife because of the common attitudes. but aerith really loves Zack more than cloud. :)) aerith gave up on cloud because he love someone else, someone from his childhood past..... ( P.S. cloud and aerith NEVER dated. )
Zack was charming to Cissnei the first time they met in CC, but their relationship in the end amounted up to friendship between working colleagues. He starts going out with Aerith, however, and it is evident that Zack not only likes Aerith- he loves her. It's even stated in FF Ultimania that Zack admits that Aerith had become irreplacable to him.
Zack Fair was in love with Aeris/Aerith Gainsborough.
Opinions are highly split on this one. Generally speaking, most of the people agree that Aerith loves Cloud more (and that the love for Zack is a friendly/brotherly one).
She knew Zack for quite a while. He was locked up in a basement for several years. Whereas she only knew cloud for a few months(?). I am not sure FF7 has a strict timeline. But it was like knowing the same person afterall.
in advent children, yes. but, aerith and Zack bring him back to life
I have no idea what you mean, but I don't think Zack is neither a girlfriend beater or a plastic surgeon
There is no husband mentioned, only an old boyfriend called Zack Fair.
Cloud reminded her of Zack and therefore she was attracted to him. But she loved Zack more. She dated him for over a year, still wears the pink ribbon he bought her, still sells the flowers in the cart he made her, won't get the cart fixed by anyone other then Zack himself, wrote Zack 89 love letters over the course of four years, and wears pink because of a silly exchange between them. Aerith knew Cloud for a a couple of weeks. She never got to know the real Cloud and is now reunited with her true love, Zack, in the lifestream.
She is 16 years old before Zack is held captive for four years.