@CoastalRat,
Coastal Rat could be onto something. Maybe she thinks she has to talk about gay stuff since you're gay. She may not realize that being gay doesn't mean you can't talk about everyday stuff.
In any case, if the only reason you're staying at that job is because she's there - that's not a good reason to stay.
And - if you're having doubts about your relationship, deal with that.
The work and primary relationship issues really have nothing to do with whether or not the other woman is gay/bi/interested.