Why can she drop me so easily? Why am I an after thought? Negative thoughts, feelings, getting into a downward spiral.
I feel and have felt exactly the same. I tell myself the feelings will pass. Invariably they do; sometimes it takes a while, sometimes I need to distract myself with something. Other times just going for a walk or phoning a friend.
I share your analysis of everything too; I don't think you are ever going to find reason or logic in their behaviour. Its illogical, irrational and doesn't make any sense. Trying to figure it out will send you into the depths of despair. I'm still there in some ways. I try not to blame myself, which is not easy.
They are in a lost and confused world, void of all emotion. Its not you.