i think that snakes run almost exclusivly on instinct, and as such do not show anything we can precieve as love. i think it is all to do with humans easily anthropomorphising things. saying the snake feels sad or angry is a form of Anthropomorphism. I dont doubt for a second the snakes are able to recognize certain people with whom they have had past encounters, but i highly doubt the can show, or feel some kind of "love". in nature there are few forms of love which i know people will beg to differ about but when it comes down to it only a very few animals can show "love" and snakes are not one of them.