I think you should have no guilt about severing your friendship despite the job referral. As Mote of Soul says, they are separate issues and you probably already thanked her for the job. The thing is, not only has she already done this once, but now she is approaching trying to encroach upon your relationship a second time. In this case I would say two strikes and you're out. In fact, I would have severed my friendship the moment she went home with the first boyfriend! I would have no qualms at all about severing the friendship. This is no friend of yours. She is fully aware of her flirtatious behavior by you pointing it out. She is not oblivious. This is deliberate on her part at this point. And why is she insistent on getting to know your boyfriend? That's suspect to me. Something is very wrong with her. I am in fact offended & disgusted by her behavior on your behalf.