Breaking the manga, ie the two girls no longer living together, might be a way for him to end it. Because he's not going to keep it up forever.
That was hinted at in the last "serious" chapter, when Ran was wondering when the next crossroad would come and they may have to separate.
Basically, there's only two routes possible for the end : they become a real couple or they separate.
An open ending with them living together as roomates/friends for the next foreseeable future would be quite a let down (though I don't rule it out either).
(and this was my 301th post)
last edited at May 19, 2015 8:34AM