How do you feel about being fit and muscular? How does training and racing make you feel? How does your relationship with SO make you feel? Do you for see continuing your active lifestyle as long as you can? Do you see SO being in your life for the long term? These are question you could ask yourself.
Many guys feel threatened when women get in shape and possibly attract attention of other men. I know men that like chubby women because they feel more secure with them than being with a fit sexy confident woman.