Are you watching your breath or watching your opinions? It is not enough to just watch the breath; you must reflect closely on what is arising. Come to the truth of the way things are by identifying and letting go of your opinions. Reflect on what you pay homage to and how to give birth to the truth in your heart.
Loving kindness (metta) is a mental state that can be developed through openness of our heart, thereby experiencing greater freedom of this mind/state.