To have your heart sing when someone walks in the room means that you are happy to see them and they make you feel good, while to feel like your heart contest every time when you see them walk in the room would suggest that you are anxious or nervous around them.
Context: I feel like my heart contest every time when I see him walk in the room.
Hypothesis: My heart sings when he walks in the room.

Is the hypothesis incorrect? (Yes, no, or unknown)?