I have noticed a pattern, and experienced it myself where the first relationship after a long term relationship has broken up seems to be abusive 
I had a long relationship with 3 kids resulting, we split and the next guy I got involved with was a fucking horror show. The textbook definition of a covert narcissist, he really fucked my head up. I used to think the ex I had kids with was awful, but he is a pussycat compared to this headfucker (still not great, I still think he is a dick).
It does seem to be a pattern, why is this? Thankfully he put me off old for life and I have ceased to give a shit about men. It seems to happen again and again though that the first relationship fucks women's heads up. God hindsight is a wonderful thing.