This is disturbing and I'm not sure who is the target for it. Homegirl is frustrated because her boyfriend is bad at sex. Of course, she doesn't communicate with her boyfriend because, I don't know, spare his feelings or some shit. Then the delivery guy helps her when he sees her being harassed on the street and she wants to take him out to dinner as thanks. Dude's fawning, deer in headlights "uuuhh pretty college girl" and because he visibly likes her and is a hunk she doesn't even hesitate and takes him to an hotel. Here we see big dick is everything: dude does nothing, she straddles him and it's the best sex ever. Then they spend hours fucking and amazing chemistry, huge dick, infinite stamina. Until the boyfriend calls. She, of course ignores the call and will gently break up with him... just kidding, she picks up the call, states she is at the love hotel and will show the boyfriend what it means when she comes. She never told him anything before because she wanted to, checks notes, ah, yes, spare his feelings. Maybe.
This is cruelty pure and simple. The phone call was unnecessary and adds nothing beyond saying this woman is an absolute sociopath. If she only replied with a "I've met someone I like, let's break up." or *gasps* just ignore the call and add a panel with her breaking up after, it would be way better than this. Homeboy didn't even stole the girl, she just went for it without a care in the world.
A friend of mine told me that once he was with a girl in college that had a boyfriend, she got a call from her after having sex and she was happily planning a date with the boyfriend while touching my friend and looking at him. My friend was horrified and completely avoided her from that point on. Even as a horny college kid, there is a line where "young, horny and stupid" morphs into something else and he wanted no part of it.