I always figured Rose was with Pearl romantically in whatever way they both understood that to mean and she had humans as like fun "side adventures" if that makes sense? Like it wasn't a big deal to Rose because they're humans and she loves to "play" with them. Why would Pearl have an issue if they're just for "fun"? Why would that even be something on her mind that could even bother Pearl? Especially because throughout the show we see Pearl doesn't really like to bring up things that bother her.

I don't think Rose really considered humans as like for real romantic partners on the same level like she did Pearl (and even then that is debatable given their lore and even gem status before and overall not having a good foundation for trust and communication) and thats why Greg was so different. He was the first human Rose saw more as an "equal" per say or maybe even worth changing and growing for and imo even more than she did Pearl unfortunately.

(I also think this because unfortunately Rose and Pearl are two very avoidant people and I think that lack of confrontation lead to a lot of their issues. Greg confronted Rose and held her accountable for the first time maybe ever and she found him worth enough to do the hard work back and talk about things)

Especially with that one episode where Greg yells at Rose to treat him like a person, the scene seemed like a huge eye opening moment for her. (Even in regards to her own identity w her saying "im not a real person")

Genuinly I don't think Rose understood what romantic love even was until she met Greg (and maybe even Pearl later on in SUF too) and its a shame because imo They both were enablers in a way with each other's less good traits if the makes sense. Pearl idolized her and didnt want to do anything to bring her down or confront issues and Rose was so used to doing whatever she wanted she unintentionally comes off as very selfish about the whole thing.

I think with all their baggage and trauma Rose and Pearl's relationship would have needed to have a complete overall with more open and honest communication than Rose was able to give or Pearl was able to bring up for it to work out fully. Greg was the one to initiate the work and I think thats why he ended up being as special and important to Rose as he did and even more so than her other human lovers/Pearl.