wow, interesting situation... I think you should really look at the relationship if you are questioning whether or not to tell her about something that really should effect you both... I'm assuming you live together... if not then maybe you shouldn't until you are ready to make the step towards commitment. or you could just lay it down logically to her, and say yes I am making more money, but thats no guarantee that I will for a long period of time... so ask her not to rush you and explain why... if she can accept the reasons it should be all good... if not, well, I guess it wasn't a very strong relationship to start with....