Well, I have not come across this, I can only guess how it will be better. It seems to me that you should pull yourself together, try to find an approach to your girlfriend, if she is dear to you, of course. If you are tired of the relationship, then leave her and start life over again. Moreover, you have rare sex. You are not an old man, for your own health, you need to do it. Therefore, be patient and start moving forward. And this will help to satisfy yourself. Good luck!