In particular, the bit about the persistent apologies. From the Reddit link:
He's distanced himself from the situation - his nauseating apology texts are dripping with the clueless narcissism that deeply engrained chauvinism is made of: "I know you said not to contact you anymore but I have to apologize so I can get over this... This has turned out almost the exact opposite as I thought it would [sic] and has caused me inexplainable [sic] discomfort .... I just have to come out and say it, I like you."
Also, some of the stories in the comments had similar elements, like:
This exact thing happened to my current gf after she was raped. She just wanted to bury it and he kept pushing his guilt on her for about a year sporadically begging for forgiveness and for her to help him convince himself it wasn't actually rape.
The initial behavior is bad enough, but the continued demand for interaction and forgiveness is entitled and pathetic.
Incidentally, I'm curious as to why I saw this link on the front page of HN from my phone, but when I jumped on the desktop to comment, I was unable to locate it anywhere on at least the first four pages of HN. Now it seems to be back on the second page.