Stuck with obsessive thoughts

I have been doing really well with NC. No contact since October except one or two feeble attempts by him to reach me at my workplace. What has been on my mind and I can't get over is what he told me the last time we talked (and incidentally tried to get me to sleep with him). He told me that he was dating a woman who he was set up with by a mutual couple we knew (and who I no longer talk with since the break up). The woman of this couple was pretty close with me at one time and she knew a lot of what I was going through with my XN.

So what has been bothering me is why she would set up a friend of hers with this assclown? Are people really so naive, as in head in the sand, that they don't get what really went on? Sure, they see his public persona, which is golden. Handsome, life of the party, etc. but this woman knew intimate details which were not pretty at all!

This man took my very soul and left me emotionally, physically and financially bankrupt. How was he able to convince them that he would treat her friend differently??

I honestly don't know if he's still seeing her. I really don't care. But I needed to vent and ask the question to others who have been where I've been. Who would want to set up a friend with someone who at least one of them knows intimately that he abused me??

Any insight would be greatly appreciated!

WS