It's ok to love her. It's ok to feel ecstasy when you hold her and make love to her. But it's not ok to need her.
Ultimately, we need to maintain emotional self control. Be stoic in the worst moments of the relationship, even though they are masters at getting a rise out of us.
That is, if she says it's over, she only gets poker face. You need to be able to jump straight to Stage 4 of the Five Stages: Acceptance. She observes no Denial, no Anger, no Bargaining - and hopefully no Depression.
The strong suffer in silence.
When we do this, we pass her ultimate test and (along with self improvement, time and space) it's our best chance to restore her interest level.