What is the most hurting part of relationship?

I have a girlfriend and my family is not agree to accept her as my wife
I convinced so much to my family
They are not agree with me
I can see the future of my relationship
I am seeing that it is going to hurt me a lot
And seriously i don't care about myself
I m scared about her
What will happen to her
She loves me a lot.
What is the most hurting part of relationship?
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