I dunno, I think the problem right now is that Wei Wei is just trying to enjoy her hot young girlfriend without actually making an emotional commitment to her. She's obviously been hurt pretty badly, she's at least partially in the closet, and her girlfriend broke up and married a man.
Her dating a kid just for fun isn't the way to resolve her pain, she needs to be able to actually have a real relationship, and from the last chapter it seems like she's still kind of avoiding getting too emotionally intimate with Ding Yi, even if maybe she's not even doing it consciously.
Plus of course Ding Yi's got her own shit going on, which we still know almost nothing about, but obviously she's keeping all of this a secret from her own family as well. She could very well be hoping that Wei Wei is going to take her away from her family.