I have a theory. I've only read 9 chapters (of 16 so far, ongoing) so it really is just a theory right now, but my money's on Suzuki having powers, and Sasaki knows something. And I'm betting one of Suzuki's powers is good luck.
Dude's afraid to talk to his own girlfriend.
I know he's supposed to be a coward and all, but c'mon author-san, he doesn't need to be a complete invertebrate.
The real amazingness here is that Sasaki doesn't break up with a boyfriend who avoids her for a whole week.