Have you asked her why she keeps wanting to talk about your past job? I'm curious about her reasoning for it! Did you tell her that you had more important things to talk about, and explain why the past job wasn't a suitable topic that day? If you did then she really should have respected that, but if you didn't then she might have thought you were avoiding it due to it having some bad memories or something? I tend to avoid topics when they make me uncomfortable, but if there is something I am flat out. It going to talk about then I say "I'm not talking about that right now" and he respects that. But I have to make it clear.