I would feel more sorry for him, but after declaring he likes the uke, he so easily changes to Okuzono. If he truly had liked Yamashiro, he wouldn't have changed his mind like that. Same with the girlfriend. I just can't bring myself to feel any pity for people like that.
I made an error in my original post - I meant to say "Poor Murata." I felt more pity than sorry, because Yamashiro openly used him, and then Okuzono purposely stole him away, without having feelings for him. Even if Murata was fickle, and easily went from liking Yamashiro to liking Okuzono, he was just a pawn in the middle being played by both. Neither one had true feelings for him to begin with, and that in itself is pretty sad. The girlfriend I didn't feel bad for at all. Yamashiro didn't date her to "use" her - he probably liked her to begin with, but she was an easy steal for Okuzono. No pity there at all.

I feel sorry for the guy being used.