I'd catch a grenade for you
Throw my hand on a blade for you
I'd jump in front of a train for you
You know I'd do anything for you
Oh, I would go through all this pain
Take a bullet straight through my brain
Yes, I would die for you, baby
Bruno Mars - Grenade
These lyrics imply some sort of deep affection for the girl in question, but is there a certain term for it?
I'm hesitant to use the word
desperate because it also implies that he is trying in despair with little hope of success. However, this just seem like deep affection to me.
I'm also hesitant to use
infatuated because it implies that the affection is short lived, although there is nothing here to indicate such.