Jamie is still trapped in the cycle of dehumanizing behavior his father subjected him to in every interaction. He can't escape as he has done his entire life, because his father beating him and throwing him out like garbage makes real for Jamie of his worthlessness in his father's eyes. The pain of that realization is devastating and traumatizing, and on top of that he is now left with an "ache" that leaves him broken and frozen. A lifetime of being told nothing you do is good enough can't be turned around in a few days-because you learn to internalize and survive by clinging to what little you can control. Art is Jamie's safe harbor, and right now he may not be able to escape to it, because he may unconsciously be seeing it as the reason for his father's abuse. As it seems Luca experienced trauma of his own-he may be the perfect person to help Jamie recapture what his parents stole from him. (You are on the right track with how the story is unfolding. The angst is palpable, and that is opening the reality of what happens to many LGBQT kids, and also to kids with parents who are hell bent on having their kids living a life they failed to live.)