no good deed ever goes unpunished
Due to the cruelty, ignorance, or selfishness of the world or others, one's good deeds or good intentions will often result in more trouble than they are worth. An ironic and sardonic twist on the more standard moral that "no good deed goes unrewarded." Janet: "I decided to help George clean out his gutters, but now he's got me doing all sorts of repairs around the house!" Bill: "I guess no good deed ever goes unpunished, eh?"