Whether or not people thought Kei1's reaction was strange, I kind of found it understandeable. I mean, admitting how bad the situation is, and freaking out about it wouldn't help Kei2's situation. He just tried to tell him his best chance at happiness was with Reika now.
And, kinda got the feeling that Kei2 was considering raping Reika out of hate. Personally glad he didn't go through with it.