I’m surprised to know that you are in such a close relationship and how come he has not disclosed this relation to his parents. You love him so much but in 4 years, he has not given you trust, faith or hope. Considering these facts I think, what keeps you in relation is not your love but your emotional dependence on him. When you feel that your expectations are not meet in any relations then it is a time to introspect and analyze your needs. Reexamine your relationship, be clear about what you want in relationship and then discuss your feelings keeping that background in mind. I am sure he will understand your feeling if he has genuine feelings for you.