Answer:
"Falling in love" or "taking the fall" for something are both idioms.
"Falling in love" is an idiom that means to become romantically infatuated with someone. It suggests that the feelings of love and affection happened spontaneously and unexpectedly.
"Taking the fall" is an idiom that means to accept responsibility for something that has gone wrong or accept the blame for a mistake. It suggests that one person is willing to face the consequences for something that may not have been entirely their fault.