Relationship progress in manga and anime is for faggots that don't want to make money forever. (Rumiko Takahashi is the patron saint of unending manga.)
But at least School Rumble's author has a tiny bit of taste; Harima's not doing the runaround with the spazzy dipshit love interest he was originally chasing. Second-Best Girl (Yakumo) > Dipshit McMoron Initial Girl(Tenma).
It's a pity Love Hina didn't go this route. Mutsumi was massively superior to that tsundere-on-crack thundercunt, Naru.