i wouldn't consider it cheating when she's under the impression her relationship with kanaya is over and they won't meet again also she clearly isn't over kanaya when she admits to replaying her memories of her and kanaya's first kiss her relationship with terezi is a rebound
why do some people think rosebot is cheating on kanaya in meat i have to think they either didn't read the epilogues or just don't care enough about rose and kanaya's relationship to actually understand what's going on with them