Only you can determine what a fair price is for anything you decide to purchase or sacrifice for. Certainly if you die you won't be able to be with the person you love. However if you are dying to protect a loved one's life most people would consider you a hero. I personally believe those who would sacrifice their life for the person they love do not have to ask any questions of themselves.
It's more of a reflex response to a given situation. (A parent jumps in front of car while pushing their child out of harm's way. A man gets between an intruder and his family.) These are instinctive reactions when danger is present.
Nevertheless that is completely different from staying in an abusive relationship "even if it kills you" because you love that person. Your sacrifice would have been in vain and unappreciated. You have to (love yourself) enough to choose the "right people" to have healthy relationships with. To sacrifice one's life in a relationship where their mate does not give a damn about them is a waste of a life.
One man's opinion!