<human>: Can you provide a brief rundown of the text in within 3 sentences?

My girlfriend is a wonderful and beautiful woman, but she's never been very athletic or into working out at all.  She has a curvy body type (by that I mean she's shapely, I don't mean it as a euphemism for "fat") and often frets about not being toned or having a flat stomach, but she also doesn't stick with any workout regime at all.  She'll decide to start running, and she'll run a few times a week, up to a mile at a time, but then she'll drop it after a while.  Same for any other workout program; it only lasts a few weeks tops.

I'm not skinny by any means, but I lift fairly often and I'm a binge-runner (i.e. I train for a race for a few months, then drop running all together for a few months).  Once I started marathon training a couple months ago, I started losing weight and getting more toned.  I felt great about it and was excited about being more attractive to her.

But she's not excited about it.  When I told her I was losing weight, she got mopey and sad and told me she felt self-conscious.  She was afraid I was going to suddenly think she was flabby.

I now feel *guilty* about losing weight and toning up and training for my marathon.  And while I love my girlfriend just how she is, I wouldn't hate it if she found a workout program she liked and stuck with it; if for no other reason we could workout together and share that aspect of our lives (and as an added bonus, she might get more toned).  But I don't feel like it's my place to tell her to not quit her workout programs, or to tell her to workout more, or to be more toned.

Any advice?
<bot>: I'm losing weight and getting more toned, my not-very-workout-inclined girlfriend is getting self-conscious.  I now feel guilty about my results, don't know how to handle it.