Okay, so I found a new piece of game evidence that points towards Aerith. When you are at the end of the Temple of the Ancients, Cait Sith gives Aerith and Cloud a reading of their future. I wasn't going to use this before, but after just playing the game getting a date with Tifa, I have discovered that this is not variable text. The prediction that Cait Sith gives them is that they're perfect for each other.

Even if you've been mean to her the entire time (as I did in my game). So it's pretty obvious that even if he didn't love her, they certainly would have made the perfect couple. Even better than him and Tifa. Even Marlene thinks this. When Marlene says that she thinks the flower girl likes Cloud, if you respond "I don't know" she says: "Stupid".

Okay, I think that was acceptable, because no matter what you say to her, she says something that would be condusive to you liking Aerith. For if you choose the option, "Let's hope so", Marlene says, "It's okay. I won't tell Tifa." So, I hope this is admissable. If it's not, then just let me know Ruyshikaze.