How do I love myself??

I’m in a committed relationship with the most beautiful, special, incredible soul I have ever met. We have been together for about three years now. And kind of been having a snag in our relationship off and on because of me. I am so in love with her. She is the most amazing thing that has ever happened in my life. And I would do any and everything just to see her smile, to hear her laugh to protect her and make her feel safe, but the only thing she acts from me is to love myself. To see myself as she sees me and to treat myself as I would her. And for some reason it is the hardest thing she has ever asked me to do. Because for some reason I can’t seem to do that. No matter how hard I try. I don’t look at myself in the mirror, I don’t take care of myself as I should I care more about her health and well being then my own. And I fear that this issue will cost me losing her. And God know that’s the last thing I want. But I don’t know what to do or even start into fixing my love for myself so that I can be a better me for us.