Empyrea
Pro Adventurer
I might be in the minority on this one in that... I don't think it matters ^^;Does Tifa knows that Aerith as a thing for Cloud though? The only conversation we know they probably had is about their first love, so Tifa's feelings for Cloud and Aerith's for Zack.
At the end of the day, after LS, Cloud definitely loves Tifa above all and the sequence lays it all bare for us to see (and have secondhand embarrassment over, for some?) while regardless of what she feels for Cloud, Aerith is still not over Zack and is now on the way to reuniting with him finally (and it can't happen any sooner, please, my boi Zack is trying so hard).
Anything else is a what-if scenario. And Rebirth pretty much says, "Look, Aerith herself isn't even sure and she's dead now, soooo...."