You do have an option to ditch Erynn after the cafe scene, given how it plays out it can be quite definitive.hmmmm an Erynn that did laugh at him and made him cry (even with assistance from that dude) WOULD have been different for sure as most games force a makeup or something close to it. Then it gives the MC choice of letting past go (the Erynn path) or no. (your cold to Erynn and is most likely Alex or Lauren path). Then when pool thing with moms he would be mad at both Erynn AND her mom (feel like Erynns mom got off too easy for kiss). Then cafe scene with Erynn and that guy and MC just has had it with her.
Backstory is now different from original expectations (we don't know if it was always suppoused to flip), but you still can say "enough is enough" to Erynn.
But dude, Erynn's mom (Melissa) is single why would he be mad at her?
I mean there isn't even a good reason for him to be mad at his own mom in that scene (only his jumping to conclusions on a ridiculous degree leads to that).