There are some relationships that can break(Layla is gone already if you picked the option so i won't include her).Only Alexis is break up option she is only character mc put a label on their relationship... after he realised it was a rushed decision or still likes Erynn or likes Val they would break up without freaking drama like adults
And facing Layla Elena drama
Alexis is one, if you chose to reconnect with her earlier you've been stuck with her up until now(as you say it's the only official relationship), it's fair to offer a jumping off point for those looking at other options, there have been hints that this is coming.
Nikki/Cara isn't official like Alexis, but the MC made some promises to them, including that he was going to break up with the girl he was dating, calling them and saying "sorry changed my mind, i'm gonna stick with xxxx" is a possibility.
Val apparently is gonna say something about the MC having a GF, so that's another one... probably something along the lines of "it's me or her, make your choice".
So you may be forced to either break things off with Val, Alexis (that we've already discussed), or lie to both girls...
Those are the ones i find more likely.