Should we stay together if I am not in love with her?

We have been dating for a while and our relationship is really wonderful. I love her and care about her. Lately I have been realizing that I am not falling for her, like head over heals in love. She, on the other hand, is in love with me. Do I break up with her before it gets too uneven? Or do we continue to love and enjoy each other, like we have been for the past 6 months?