Was OW included on an invite from someone else? If so, xBF can't help he's on the same distribution list as OW. Maybe she just joined trying to get in contact with him? I guess I am just playing the "benefit of the doubt" card here, because I don't know exactly all the details or history, but I think you need to be careful not to jump to conclusions at this stage.
Having said that, I am not advocating you lowering your standards, just trying to remain objective.
