Sage is a weird one.
Everything up to staying with her after the Josy reveal feels like her using MC. She finds him hot and her and chad don't fuck, so why not fuck the guy that is getting under Chad's skin and is willing to stand up to him. i think she's genuinely into Tremolo, she seeks him out, but outside of the first kickboxing session they don't really bond
But then she lets him stay with her, tries to take his mind off things with the movie night, when it doesn't work she's upset that he's upset and holds his hand, there's an optional conversation where she says she'll always make time for him at the Cathy party, then you have the outdoor guitar lesson which is where i feel like she catches feelings
It's a weird arc, it feels like the early episodes she was meant to be a completely different character, closer to Quinn than what we now have with Sage.