Just got to the end of the latest update on my Alexis/Nikki/Gabi run.
Well, that cliffhanger is a real moment of truth; I suspect that it will be the last opportunity to break up with Alexis under a decent pretense, without scandals caused by MC's cheating. However, if their relationship survives this, then it's true love and Alexis has to be the endgame. I'll probably still use the "daddy Santi" excuse to part ways with Alexis, regardless of whether they are blood-related or not, and get a Nikki ending (as Nikki may not receive the luxury of getting an amicable breakup). Yet I can already imagine the ending I'm gonna get (no spoilers here, just a fantasy):
MC breaks up with Alexis and tells her why, breaking her down completely. He then makes sure that Erynn is free of Ethan's influence, makes his relationship with Nikki exclusive, ceases all contact with Gabi, and distances himself from his current circle of friends.
All goes well until, the night before the wedding, Nikki gets an unexpected call from Alexis who tells her that MC really had no intention of breaking up with Alexis despite what Nikki had told him and lied to her about it, and only turning out to be her (sort of) brother made him change his mind. Credits roll, and a message from a walkthrough mod comes up, saying: "To get the perfect ending with Nikki, don't get back with Alexis after the Erynn drama back in Ep. 5."