We are having a relationship for more than 5 years. Now as we have some religious issues, she wants to move on and marry a boy of her same religion. But as we already had a sexual relationship, I can't move on from her. Always I feel very sad, as she will be married, I will be all alone. And I can't really agree that she will marry someone other than me and will be in a sexual relationship with him too. What should I do right now? Should I breakup with her? How?