This statement uses a playful and metaphorical language to express affection. It humorously compares the person being addressed to a "thief" because they have captured the speaker's heart.
"Baby You Are a Thief" is a metaphorical expression that playfully accuses the person of stealing the speaker's heart. It's a lighthearted way of saying that they have fallen deeply in love.
"Because You Stole My Heart" reinforces the metaphor, emphasizing that the person has taken a significant place in the speaker's affections. It signifies that the person has had a profound impact on the speaker's emotions. In essence, this quote uses humor and metaphor to convey a sense of love and attraction, playfully suggesting that the person has won the speaker's heart completely.