Love That Lasts Forever?

The shelf life of love always fascinated me. It was always odd to me to think that people i once adored and cared for floated away from my life only to become glimpses in the fog. There is a great line in Hey Ya by Outkast
If what they say is nothing is forever,
Then what makes
Love the exception?
Is love the exception?
I remember my first serious break up. Her name was Liz - we had an intense six months relationship. She was everything i wasn't - lanky, sexy, and out of control. Every week she had another solaticious tale to tell me about the guy she blew behind the Starbucks or dancing all night long in a cage while high on E.
"Petitedov," she would say looking me straight into my eyes, "don't ever have sex when you're on e."
She was full of worldly wisdom. My virgin self would keep this in mind for a long time - hoping that maybe her bad ass behavior would transcend onto me. I couldn't understand why she wanted to be my friend. I wasn't beautiful, punk boys weren't chasing me or bedding me, i didn't even smoke pot. I was awkward and lonely, i read a lot - i liked talking to adults, what did she see in me?
So i should not have been surprised when she stopped talking to me. But I was. I was hurt and stunned. I agonized for months my love for her burning me. And then one day i woke up and realized how much i really disliked her, besides the occasional "shocking" details i found her to be boring and shallow.
Then there was my first romantic relationship - to put it simply he was an asshole. I know people say that all the time about their exes but in this case it is not just an opinion it's practically a fact. I cringe thinking he was ever a part of my life. It was the classic case of girl with not enough self-esteem meets Jack Ass and falls madly in love even though he treats her like shit. Suffice to say he broke up with me. A year went by before i could truly hate him and then let hate turn into indifference. You can't really have hate without love. The two emotions are very closely entwined, to hate is to care. And if you care than "it" or "they" have power over you.
So where did my love for him(and her) go? Why didn't it last forever? And can love last forever?
I have a few theories - coming soon in the next post.