Hm, if by embarrass/disappoint you're referring to the fact that MC gets caught cheating, then I guess, but realistically, MC had been embarrassing/disappointing Haley from the beginning (because he was being a trash ass partner and cheating) and then adding in what's her name and promising he'd leave Haley for her (again, not a choice the player was able to make/not make) just made it worse. And don't even get me started on the audacity of what's her name to demand loyalty/fidelity from MC when she's literally the other woman... like, fuck her, and fuck Nikki. And not in the sexy way. Neither what's her name nor Nikki had any right to claim MC, so I'm not sure how they could be embarrassed/disappointed when they're both the dating equivalent of homewreckers... and then had the nerve to smile in Haley's face...
The weirdest part about this story to me is that Nikki is essentially a predator, and if you don't end up with Nikki, she says as much herself. She basically said she manipulated MC into having a physical relationship with her and then just kept her claws in him, no matter who it hurt along the way. BUT MC can still end up with her, which I'm assuming means in those endings, the predatory nature of Nikki is never even mentioned.
At any rate, my problem with this is, while it's a choice game in some aspects, a lot of the BIG decisions in this story (some that don't even have huge impact on the storyline - such as promising to what's her face he'd leave Haley and fucking the maid) are made for us and serve no other purpose than to make MC (who is already a piece of shit) an even bigger piece of a shit.
I mean, I finished the game, but I'm not gonna replay to get other endings because of the above mentioned shit.
I acknowledge that some of these feelings might be because I'm a woman though. I most likely view the infidelity, Nikki's behavior, side bitches, and other shit differently than the average player (since this site is super male-dominated), but still...