Oh noes, MC derailed his own plans, it's not like he can say "nah actually I wanted to date your best friend, you are only my second choice".
But if I know manga this will end up with a "err yeah I was joking, you're great but I was joking, hahaha, oh also you'll not be offended by this joke but rather develop feelings for me somehow despite this joke basically being a direct insult???".