He doesn't know this now, but in the years to come he will, again and again, test Harold's claims of devotion, will throw himself against his promises to see how steadfast they are. He won't even be conscious that he's doing this. But he will do it anyway, because part of him will never believe Harold and Julia; as much as he wants to, as much as he thinks he does, he won't, and he will always be convinced that they will eventually tire of him, that they will one day regret their involvement with him. And so he will challenge them, because when their relationship inevitably ends, he will be able to look back and know for certain that he caused it, and not only that, but the specific incident that caused it, and he will never have to wonder, or worry, about what he did wrong, or what he could have done better. But that is in the future. For now, his happiness is flawless.
Hanya Yanagihara, A Little Life
relationships, self-sabotage