Sure,
we could see that, but he's at the bottom of a friggin cliff.
And that's just taking the physical distance into account. You're also forgetting the emotional trauma our MC has due to that chucklefuck. If he wasn't inside an invisible bubble, he might have tried to get Arisu back, but he was stuck in his own safety net, useless to do anything.
It's cliché that these "not-betrayals" keep happening in manga, sure, but our MC was driven to the point of attempted murder, to hell with the consequences. Being faced with the same guy who drove him to that state
again, while unable to do
anything, is a better excuse than most MCs.