Bro, I thought he was gonna apologize to her for telling the dad they were engaged, or maybe ask her again to reconsider (gross but that would have been less rage inducing)
Then he TRIPLE-downed like bruh you really think that tossing her ring and then kissing her was gonna score you any points? Even if you're desperate that's just disgusting.
I hope she never talks to you again. Even if Sunohara appears right now and is a bit jealous, I'm 99% sure he would understand and talk it out with her and not get pissy, unlike a certain someone who apparently can't take a no for an answer.