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First spiritual: Pray about the relationship and its myriad issues. Pray for insight, revelation and direction. God will tell you how to proceed forward.
Second Physical: Bring these issues to the table, discuss them unselfishly, be willing to compromise on some issues and see if you can come to agreement on them.
I am sure after doing all these sisncerely, the decision will be clear and easy.
If you will have to quit, then just sit her down, tell her all you think and see (physical & spiritual) and why it will be best if you both accept and move on.