I feel this way with my wife every time I'm reminded of the things I can not provide her due to my choices in life. I have to remind myself, and sometimes she has to remind me too, that she married me for ME and that she knew what she was getting in to when she married me. she loves me for me, and that means ALL of me, even the bad parts. Sure she wishes things were different, but believes its an acceptable price to pay to be espoused to me. I'm grateful for her acceptance. I hope you can be grateful of your girl's as well. Most importantly though, don't make choices for her (like suddenly leaving her under the guise you are doing it "for" her), let her in on your heart, your feelings, and you might find you have less to worry about than you think.