His heroes failed him, his mentor turned against him and destroyed his homeworld. Everything he had was lost to him; his home, his friends, his family. But even before then, the war had kept him away, so even the memory of what was lost was denied him. When he finally finds it in himself to trust again, to love despite knowing the pain it can bring, he finds out the one he loves is Revan, the one responsible for all his pain.
Yeah, he's such a big baby. Who would be emotionally scarred by something so trivial?
And yes, I know it's a game, and in reality I don't care all that much. But it annoys me when people call him whiney, yet they feel for Bastila's mommy issues just because she has big pixels.