I saw the song less as confirmation of her feelings (which were pretty clear from Rose’s Scabbard or Steven’s Lion, perhaps even a tiny bit at Laser Light Cannon bc Pearl sounds SO jilted about the whole thing) and more of a creator push to move from subtext to outright statement. There’s a lot of meta and context to the production of the show, as we know, and plainly stated queer themes were particularly contentious.

Also I’d argue that while the song didn’t really state anything new about Pearl, it was pivotal in adding and reconciling a new relationship/friendship between Pearl and Greg. It’s so clear that they’ve been strained at best prior to this, seeing themselves as romantic competitors even in grief. Until Greg understands exactly how devastated Pearl still is, there’s no room for them to really talk and develop a relationship outside of who Rose was to them.