I think he's a dirtbag regardless of whether he raped her. Her depiction of their relationship is damning to at least him and possibly both of them.
Also, there's more than her accusations. There's also his non-apology.
I was thinking more on this. I come from parents that got divorced and were quite angry with each other for years after. I remember situations where my parents had totally different views on situations. It was confusing for a long while because I never could understand as a child how my parents would both get things so wrong. It was a good learning experience because I learned that people are flawed and their ability to filter things was incredible. They were both very hurt by what happened, and carried that pain over for years and that paint acted as a filter.
I think its very reasonable to think that is happening here. Both appear to be quite hurt. Both seem to understand that both sides did something wrong. Both probably don't realize some of the things they did. But, her position seems to be far more extreme than his. Knowing that people can get things wrong, having seen it first hand, I hold skepticism. She may feel that she is being 100% honest, and still be very wrong. Her feelings might be right, but, that does not mean that he did all or none of what he has been accused of.
I'm also not saying that you take what he says as fact. That would be as silly as taking what she said as fact. I'm saying that both should be treated as imperfect people and that the truth probably is not clear.