Ok I will respond to your question here...
IMHO and for a pure logic...I might have no idea of what I am saying hehehe...
The difference between a person who doesnt want to be with you and WAS and MLC its basically that the person who doesnt want to be with you has choose they dont want to be with you...the reasons might be hundreds or only one but they just dont wanna be with you...
A WAS and a MLC are people that because of different factors they dont want to be in the R at that time, pressure of not accomplishing their dreams, depression, illness, adictions, abuse background...many external reasons...including affairs...its basically people confussed in their feelings and some times scared...so that might turn around if the R was good...
Its a matter of a few factors...

When a person doesnt want to be with you, they build their life with you out of the picture....I dont know if you can understand me but its simple...

A MLC and WAS its a bunch of symptoms that move them away from the R, that might change and they might come back after they see the real situation and deal with their feelings...

When the student its ready, the teacher will appear...
Even after all this time the sun never says to the Earth, "You owe me."
Look what happens with a love like that,It lights the whole sky.