I`m no way in hell watching OTH ever EVER again BUT i need someone to enlighten me about all the Clay/Sara thingy in S7. Any help please?

Clay is Nathan's agent who was in the beginning described as a player who just sleeps around with a bunch of women. Not until episode 7 did we see his true self, he's suffering inside because of his past, aka Sara. He met her when they were pretty young (I think?) and they fell in love. She proposed to him and they got married. Their pag-ibig was just pure and so beautiful. Then, that's when it happens. One segundo she's dancing with him, being happy and the susunod she just falls to the ground (I honestly have no idea what really happened to her) and eventually dies, leaving him heartbroken. And still today, he cannot really let go of her. She "haunts" him and he always imagines as if she's still there with him. But she wants him to ilipat on with his life and therefore everytime he "sees" her she's telling him this. I mean, their story was really beautiful and touching. Tragic ending but yeah.