I don't think changmin is confused. It's a dating show after all and he isn't anyone's bf yet so he can date around and get to know different people. Also jeonghyun always said that he wanted a single room from the beginning of the show.
Seonyul and hyeokjun were interested in each other at first but could not express themselves because they were roommates, it can be difficult to get out of the friendszone once in. So I think being in separate rooms would be better. It's a mature move, they can visit each other plus didn't jh say he likes his space and private time? Lol
Eunchan just needs to wake up and stop annoying me with his ideal type ideology, like give others a chance and show interest in other people . Most of them are just still hung up on the physical appearance, at episode 7 I was thinking they would have gone past that. I hope changyu and jeong ho develop some connection