>>947437Having similar values is the most important thing in a relationship, and it sounds like physical activity and fitness is a very significant value in your life. While I can't say for sure since I don't know you or her, I am assuming that you aren't staying with her out of true love, but rather out of attachment. I've been in the same situation. Was with a girl who really wasn't the right match for me, and I thought I truly loved her and that's what kept us together, but it turned out it was just attachment and I realized that within probably a few weeks or less of our relationship ending.
Reflect on this honestly, anon. To do this, ask yourself this: If you met her for the first time right now, as you are now and as she is now, would you start a relationship with her? If the answer is no (which it seems to be) that means you're just attached, and she's not the right one for you.
I know it's hard to accept that conclusion, but once you fully accept it, it will be best for you. And probably best for her too, because if you're staying with her out of attachment rather than true love, you're probably not as good of a mate for her as someone who shares her values and would be a better match for her.
Relationships of attachment are detrimental to the wellbeing of both people. End it, enjoy being single and free until you find someone who shares your values.