I hope the remake really clarifies how she feels about Zack after meeting Cloud because she doesn’t seem to dwell on him much in the OG
I never really understand this position, because to me it feels like dwelling on Zack is pretty firmly established as Aeriths main character arc in FFVII in regards to romance.
There is a slight nuance here that I think is actually really important.
Some people say that Aerith in FFVII is "falling in love with Cloud", I say she's "getting over Zack".
It's the same process, but the focus is very different. Just falling in love with Cloud isn't a character arc, it's just a mechanic. What really shows "growth" is Aerith accepting the past and moving on.
I've always seen Cloud as being very much of secondary importance here, it's not about Cloud, it's about Zack (and Aerith), and how Cloud helps her get to terms with that.
The reason I say so is because in my opinion Aeriths storyarc in FFVII in regards to Zack is firmly wedged between two scenes that together constitute what people pretend as the "evidence for Clerith". Namely the two dates.
Ignoring the single flower scene, the real first meeting with Cloud and Aerith is when he falls through her roof, like Zack did. Zack falling through the roof is a CC thing so I will ignore that since we're talking about OG. However the OG still implies pretty strongly later on that Aerith here is latching onto Cloud because of his similarities to Zack, Cloud is essentially a stand-in.
Anyway, the first thing they do, their first meeting, is a date. And what is Aerith working up to during this date? Asking about Zack. This date is about Zack. This sets-up her characters journey, and it's not about Cloud, it's about Zack. The remake makes this more explicit "gotta look forward, not back". But the OG already implies this.
Then we have the journey, where despite people's beliefs to the contrary, not much romance happens. What mostly happens is that Clouds fake persona is being set-up, which will later be revealed to be based on Zack, which gives context to what was actually happening between Aerith and Cloud during said journey and why Cloud could help her through this. In fact, the most emotional moment in regards to romance is again related to Zack, it's the scene where we meet the parents in Gongaga. This is the second clue we get about Aerith, hinting at the past that is underlying her current actions. Zacks name was hinted at during the first date, here more is revealed. On a second playthrough we can understand that Aerith coming to terms with her feelings regarding Zack by traveling with someone whose personality is based on Zack is most definitely "about Zack", not Cloud. The whole "I have 23 tiny little wishes, but I've combined them into 1, I want to spend more time with you" thing again just makes explicit what the OG already heavily implied, that what Aerith is getting to do through her journey with Cloud was to "spend more time with Zack". Cloud is Zacks living legacy, he essentially takes on Zacks duty here by narratively allowing Zack to fulfill Aeriths wish post mortem.
Then the second bookend of this story comes in the form of the second date in the golden saucer, a date which is once again defined by Aerith talking about Zack. That is the subject, that's the plot point getting addressed. Aerith is now pointing out how she saw Zack again in Cloud, but that it's not the same, that he's not the same, and that she wants to get to know the real him.
This marks the end of this particular story beat. We have Aerith seeing Zack in Cloud, her coming to terms with her past in regards to Zack by traveling with Cloud, and here we have her finally letting the past rest. While the entire story is about "gotta look forward, not back" everything prior to this point wasn't "aerith looking forward", but Aerith "getting to the point where she can start looking forward", that's the arc. The whole "acceptance of the past" thing is a recurring theme in FFVII, for Aerith this applies both to Zack, as her heritage as an ancient. Again, through Cloud Zack has now fulfilled her one wish, and by doing so she can now finally move on.
Anyway, it's after this scene that Aerith starts looking at the future, it's after this scene that Aeriths story with Cloud is about Cloud, and not Zack. This is made virtually explicit when we move from the golden saucer to the temple of the ancients, and what happens? We have Aerith asking Caith sith about her future with Cloud. This is the first, the one and only, romantic moment between Cloud and Aerith that is truly about Cloud. (or well, it's still about Zack, since Clouds personality is based off him, but at the very least Aerith is now looking at Cloud for Cloud, and not because she longs after Zack).
And then, having completed her story-arc, she dies at the most tragic moment, right after she accepts the past and starts looking at the future.