Being in love with the same woman for years.
Watching the love of his life marry and have a kid with the hate of his life.
Protecting the kid who looks JUST LIKE HIS SWORN ENEMY, except for those darn green eyes.
Dealing with a bratty and tantrum-y mind-readin' Voldemort.
Being ordered to snuff out Dumbledore's life by Dumbledore himself just because.
Pretending to be on the bad side, just like a true blue spy.
Yes kids, life can be soooo unfair. You can suffer so much for love. And in the end, yeah, Nagini.
Goodness, it sucks to be Severus.