No she doesn't feel your feelings are secondary, and no she most certainly does NOT have a relationship going on the side. And you most CERTAINLY DO matter to her more than you think. You just were too concerned trying to see things that weren't there to see that. But I think eventually you'll come around to see she loves you more than you'll ever be able to know or understand. And NOBODY could ever replace you in her heart, nor does she ever want to try to put anyone in your place.