It is commendable that you've done all that for her. I'm sorry that things have ended so badly. And yes, once a woman has been through enough break-ups, she eventually tires of the tear-stained sheets and chaste solace of her stuffed animal collection. My most recent ex and I split in March and I spent a week crying into my pillow, but then decided that it only lengthened my healing process in the past, and so I was going to go out and have a good time.
I made new friends, and strengthened my connections with current ones, and let guys wine and dine me. I know you don't want to think about her having a good time, but know that she's doing it to get past the hurt. It does no good to be emotionally and mentally debilitated when you've got a job, bills to pay, and a life to lead.
From what it sounds like your relationship values just don't line up. You'll be better off when you can heal and rediscover all the things you love about yourself, and can then share them with someone who wants to appreciate those attributes.
Do you guys work at the same gym, or is it possibly for you to switch? Not seeing her constantly would certainly help you out.