First it was warm and fuzzy.
Then it was thunders which follows by some shine then rain. Then comes the obsessions which its actually Compelling to watch it happen. And it compells me to watch it from beginning to end again and again. When you finish, you understand in the end they still does love each other despite all the incidents, troubles, pain.  
Its complicated yet simple. Love can make you do hurtful things like in the story. Then love turns to obsessive and hurt. Then hurt turns to sadness, but in the end they love each other no matter.
Dont get scared away by all the complicated or tragic implies on the summary.  Because its worth your time to see its compelling,  intriguing story. 
The ending may make you curse but think happy thoughts! You can imagine it ended well/happy afterwards.
Anyway supposedly if following the novel it IS happily ever after. (I'll never stop hopin' the day allowing them to film continuous)