I’m glad you didn’t participate in this nonsense. Clearly, you’re a grown mature woman, and Jessica is as mature as a 10-year-old child, despite being in her thirties and having a family. I can’t even imagine what kind of an example such a person can be for her children.
And it’s good that you saw the guy for who he really was. It’s awful to realize that YOU are the man in the relationship, while the actual man isn’t strong enough to support you publicly and prevent others from mistreating you. It’s good that you were only casual, not romantic partners.
Slut-shaming is never okay. But it’s even worse when the partner of the victim is acting as if it’s acceptable.