I have told him I'm only willing to be in any sort of relationship with him if she's either a) completely informed b) they split up
I think b is more likely as she meets 0 of his needs (its a very fresh relationship) and basically he likes her body. He just hasn't been able to see her to have a talk and break up with her. I also don't think she'd step back in their relationship and agree to someone else being the primary. she seems very traditional.
I have told him I understand if he chooses her but I can't continue benig the "other" woman, and that its his choice to make.