I can't x him

situation:

Mary and Peter love each other. Though Mary's father has decided to marry Mary to John, Mary has decided to rebel against this decision. So what should I say to describe Mary's action?

-Mary can't ___ Peter.

I thought of BETRAY, but I can't find a word that can adequately describe the complicated feelings between male and female. In my language, it would be a word mixing the feelings and responsibility of a pair of lovers.