You said your girlfriend and you are living in the present and trying to make things work as best you can. She isn't living in the present because she doesn't realize whats going on. You aren't dealing with things the best you can when your heart is somewhere else.
I moved to another country to be with my husband. He didn't want to marry me but did anyway because he didn't want to hurt me. He realized that he hurt me so much more because of his actions and words after we married.
If your trying not to hurt your girlfriend because she moved with you I understand that, maybe you feel obligated to her but at the same time you are wasting her time and being very dishonest and disloyal to her. Does she deserve that? Maybe you won't have anyone else if you lose her but she doesn't have anyone either, not even you now. Think about that.
Heidu

Every path to a new understanding begins in confusion- Mason Cooley