"You should not have taken advantage of my sensibility to steal into my affections without my consent"

In this quote, Alexander Hamilton is expressing his disappointment and frustration towards someone who has controlled his emotions without his approval. He uses the word "sensibility" to refer to his vulnerability and sensitivity, which the other person has made the most of. By "stealing into my love," Hamilton means that this individual has actually handled to get his love or affection without his knowledge or authorization. This might be translated as a betrayal of trust and an offense of borders. Hamilton is clearly disturbed that this individual has neglected his feelings and acted selfishly, without considering the influence on him.