this is actually funny. from her perspective:
Kazuya moved on from her pretty much immediately and found a beautiful perfect girlfriend
they had some issues and were on a verge of breaking up, so she stepped in to help with that
they apparently broken up, but nearly immediately got back together
She finds Kazuya on a date with Sumi and thinks he is cheating on Chorizo,
but finds out the reality is he doesn't have any girlfriend and just is a shallow piece of shit, just how she always thought
Now she founds another girl that claims to be his girlfriend that allows him to date whores
but hey the whore was at his place, so she can accuse him of two-timing yet again.