I love how this is going. He was never in love with her, huh? I guess that makes sense, considering the moment their "Relationship" started and developed was during her darkest time, and, guess who was ALWAYS looking at her? Yup, UTA.
She knew her brother wasn't in love with Kaoru, but she also knew Kaoru was in love with him, and seeing that Kaoru was in the worst place she'd ever been in her life, nothing Uta could say was gonna get her out of it, not because she didn't have the capability of doing so mind you, but because at that point in time, only Reiichi would be able to get SOME kind of response from Kaoru; that's why Uta send her stupid brother, that had not realized what Kaoru was going through (Which was heavily hinted at) with the words UTA had for Kaoru. That's what got them together, Uta, saving Kaoru from her darkest times.
So in a way, Uta screwed herself over, but to be fair, it was that or Kaoru falling to stupid levels of Depression and maybe even committing suicide. Neither a good option, but hey, at least in one she's alive?