Even the most civil of breakups usually leave both parties in a bit of emotional pain, parting ways with someone you were physically and emotionally intimate with involves serious adjustment and a brief (or extended) period of emotional withdrawal.
Some breakups, however, are so cringe inducing and insensitive that they almost speed up the healing process. When your ex shows just how much of a tool they are through a painful breakup initiation, it deeply sucks, but it also saves you months and years of surviving their nonsense through rose-colored glasses.
"He literally ran away. We got back from a gig and I went to put some ice cream in the freezer only to hear footsteps and the door slamming. Ran out and he was legging it down the road."
"We'd been together for 3 years. She borrowed several hundred dollars from me a week before (knowing the whole time that she was going to do this). When she broke up with me, all she did was tell me that she didn't love me any more. No discussion, no explanation, nothing. She then kept the break-up secret, moved to another city, mooched off of my friends, trashed their apartment, and nearly killed their dog."