You know I am a serious believer of the maxim "all's well that ends well". Now wait a minute don't get all conclusive with just this statement. I'm sure that is what everybody says or feels but you know this is different.
They always say that it's the journey also that matters and sometimes in our quest for the destination we tend to ignore the "woods so lovely". Well I don't per se ignore the woods but for me it's the ensemble of the journey and the destination that evokes the word pleasant. I might compromise on the journey - it maybe difficult, challenging or emotionally taxing but the end has to be happy. Its like those Bollywood flicks people are killed or die as the case maybe but those who matter survive.
Still a little addled? Let me get you closer home. We encounter so many people in our lives with their influence ranging from tangential to core but not all these entire encounters end as one would want. For me those interactions which did not have a pleasant denouement lose all their peregrination importance. Wrong I guess!
Love, friendship, care, concern are forever or never. You can't switch on and off of them and I have no clue how people are in and out of them. You can start liking people you dislike but how can you dislike those you liked? How? Well that maybe the case if you wear your emotions on your sleeves but why would you do that?
So many questions and such few answers. I don't want anyone reading this to assume my "holier than thou attitude". I do have my own eccentricities and weaknesses but these questions are probably the ones that even I don't understand. One explanation which many have given as a single answer to the questions galore is that human mind is complex and unique so it is important to understand and respect it. Well if you insist.

"You can start liking people you dislike but how can you dislike those you liked?"
Easy. People change. They become mean, bitter, angry, frustrated, jealous, irritating, and so on. Or you might become any of the above. Or priorities change. It is not necessarily a question of wearing your emotions on your sleeve. The reason you like somebody might even be the same reason you start disliking them. Or you could just fall out of touch and when you meet again, the magic dosen't exist any more; or you are complete strangers again. It is not necessarily a bad thing.