Originally Posted by
Yours Truly 
Another thing that I failed to mention is that after all these threats of disowning me again, just about a week before he dropped "the bomb" about my stepmom's 2nd round of treatments failing, he told me "I'll always be here for you." I realized then that those gestures were not sincere and that he was looking for a tradeoff.
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Yep - classic come here and go away behavior is to be expected. Also to be expected with these people is that ANY sign of being nice, generous, and the like has an angle of "what's in it for them". Every. Single. Time.