Shit dude i understand you...I had the same experience with a past relationship. It wasn't me, i was very good (actually i know i'm good) byt my girl never wanted to have sex....she lost her libido. When we had, she was very wet but the problem was that sex was very apart in time. I needed sex every almost 2-3 days, that's normal...but she wanted every 7-10 days...that's too much!!. She wasn't interested in playing sexual games, wasn't interested in sex toys. It is very difficult to speak those things with girls...they are very selfish regarding sex...they think that you are an animal, that you are only worried about sex, and they think that they are completly normal. After my experience, i know that is an hormonal problem...maybe caused for use birth control pills in the past or on the present, or her nutrition, i don't know but obviously it's an hormonal problem. If you are still fighting to get an answer to this problem, and if you have had too many fights trying to get this problem resolved, I think there is one last chance...don't say any word, and next time that she'll go to gynechologist, go with her and in the middle of the interview, ask the doctor for an hormonal levels exam. Obviously he will ask why, then you say that she have a very low libido, and start talking, and talking and talking...she will be shocked. But if the doc (man or woman) hear your experience, he will know that obviously is not normal and could be an hormonal problem. If after that she is not interested in follow the doctor instructions, I think she doesn't deserves nothing more...after that, stop waisting your time. Your consiousness will be clean, cause you did all you could have did.