Presnor comes across as an incredibly kind, dedicated, compassionate man, who wants nothing more than to help… but he’s hitched his wagon to the star of mid-century psychology, which means that he almost certainly won’t help Jeremy at all, except insofar as having a kind, dedicated, compassionate friend is helpful in and of itself.

The Heart in Exile (1953) has too much psychojargon for me to recommend it as an antidote exactly, but its protagonist who is a psychiatrist and queer at least isn't trying to cure himself or any of his patients of it and the novel is explicitly against tragic endings, which might make a change.