I'm a female and I don't think you are in the wrong at all. I'll be the first to admit that I'm often emotionally dependent, but not clingy in the slightest. Especially if my man were trying to better him self and eventually create a good life for us both.
Over the years I became the type of person who is happy with what I have when I have it. That includes other people. Let's say I'm with someone who can't be around all the time. Well then I just remember how happy I am when he IS around or when we do talk etc.. It makes it all worthwhile. Especially when you can look at the big picture.
Quiet? I love quiet! I crave it. Does she want you to be constantly doing things with her and constantly running around? Or would she be happy just being there with you. Helping you do you house work, or relaxing with a movie on the couch while doing some laundry? That's my idea of contentment. If she's actually clingy and upset about this, but we don't really know the details since you haven't given them, you need to have a heart to heart with her. Assure her of your feelings but try to come to some mutual agreement so that you're both stress free.
I can only imagine how physically and mentally challenging your training is, and it seems odd to me that she isn't thinking about it in that way.
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Snakes, Jeeps, Dragons, Nature, & Knives.. Makes my world go-round!