When it's actually Sage at your dad's she gets so upset with you that she rolls over and goes to sleep without another word. I don't know about you man but if my lady was acting/feeling like that I damn sure wouldn't just keep doing whatever I want and ignore her feelings.
I looked it up so I could be specific:
Sage: You're dropping by your ex-girlfriend tomorrow?
MC: I'm dropping by my friend tomorrow (gaslight)
Sage: Your friend who you used to fuck
MC: Who is now my friend (even though I told her she was my first love)
MC: Sage... Zoey's been important to me for the better part of my life (and you apparently aren't). Ever since childhood, she's been there for me. (except when she took off for San Diego)
Sage: I hear what you are saying, but it sounds like the moment your girlfriend leaves... you run off to your ex to spend time with her. (Can she speak any more plainly?)
MC: That's not what it is.
Sage: ...
Sage: Another way to say that is it's exactly what it is.
MC: You don't understand (She understands just fine you just don't care)
Sage: No, you're the one who doesn't understand. (Exactly)
Sage: Picture if our roles were reversed, yeah?
(Similar situation but she's spending time with Chad after you leave)
MC: I don't think it's quite the same (of course you don't because the you'd have to admit you're wrong)
Sage: It is!
MC: It's not. Also, I wouldn't have a problem with that because I trust you (guilt trip by accusing her of not trusting you rather than her thinking you are insensitive)
Sage: Oh shut up I trust you, too.
MC: Sage, I don't want to fight (just do whatever I want). I shouldn't have brought it up (rather I should have done it behind your back). Let's forget I said anything.
Sage: So, you're not going to see her tomorrow?
MC: I will (so fuck you, I don't care how you feel, whateva I do what I want)
Sage: *Rolls over and goes to sleep*
And after all that, he goes anyway. What a great guy. Where did my hero go??