The song lyrics express loving someone deeply and being willing to sacrifice greatly for them. However, the person does not reciprocate the same level of devotion, instead hurting and using the singer. While the singer would "catch a grenade" or "take a bullet" for the object of their affection, they realize this person "won't do the same" and is untrustworthy. The singer is left heartbroken and questioning why they continue to believe this person's empty promises.