Actually, I'm curious as to why you think Harry needs therapy for that particular thought, because not acting on stupid thoughts is something that I think is fairly adult.

Needless to say, it's a step in the right direction that he's not going off half-cocked, in this or in any other situation. But the ongoing self-loathing is troubling. It sounds as if he's thinking, "Well, I'm a stupid idiot, but as long as I don't act on it and just keep these self-defeating feelings inside, then it's alright." He's "revolted" by his behavior, it's "disgusting" for him to make a jealous fuss over Draco's socializing with other people, and he's relaxed and reassured by converting his other confusing emotions into this "self-loathing". He really needs to learn to be easier on himself, especially since these emotions are very natural human emotions and he doesn't even act on them, and to appreciate himself a bit more. But I suppose that's part of Draco's role, to work on making Harry reevaluate the potentially harmful ways in which he thinks and acts ;)