OnionLord777
Yaemori said that Chizuru isn't looking for someone strong, but rather someone who won't miss his chance. Umi asking Chizuru out isn't scuzzy, he was just taking a chance. He wasn't aware of Kazuya's feelings (no surprise there), he was attracted to Chizuru (no surprise there) and he didn't have a girlfriend. Sure, lying about why his ex-gf couldn't go was the worst thing he did, but that's fare more excusable than some of the things that Kazuya and Chizuru have both done (like lying to their grandmas).
Umi has been a blank slate for most of this story. But what he's done so far is, at worst, innocuous. Given what's happened in this chapter, he comes off as a pretty nice guy.
If he wanted to get with Chizuru, he could have just invited her and confess again.