Can't believe how easy it was to not see it coming. I'm thankful that at my trough, a friend I've once helped came giving me my own advice.
Never externalize your insecurities. Feel low? Avoid situations in which you will be judged socially or where you're expected to "be yourself". Take some time off alone to work your issues out before dumping them on a cherished one. Some of those cycles of despise, when allowed to start during moments of weakness, can be awfully hard to get rid of.
You'll find yourself, alone.