It means I do not trust them, I feel betrayed. Hispanics use colorful metaphors and comparisons much more often than non-Hispanics. Such expressions are not to be read literally, and they are often translations from expressions that are codified in Spanish language. Hispanics risk being diagnosed as hysterical, and are over medicated. In Hispanic cultures, colorful references to the body are common.
People tend to speak often about their hearts, breasts, guts, and genitals.
References to heart and breast when referring to emotions are more common in Spanish than in English. Hispanic women often touch their breast unconsciously when speaking about their emotions. In fact, they are talking about their chest or heart, but they can be misunderstood as overtly sexual. This point is related to the differences in body language between Hispanics and other groups. Hispanic women often move more their hands, are more expressive with their faces, move their hips, or accompany their narration with an almost choreographic dance.