I'm not saying you're wrong Yuki, but it feels to me you're over analyzing it and trying to come up with excuses for him.

The way i see it? He likes the status quo, he's already aware that the club are his and each other's friends and that admitting it might screw up whatever strange balance held them together thus far. Same deal with romance, he's unwilling to add any more factors in because of how happy he is with what's he's got right now.

TL;DR: A pussy who's afraid of change and thinks that if he ignores it it'll go away.