We all know the story of Samson and Delilah (Judges 16:4-20), right? A couple of details:
a) Delilah is being paid a whole heck of a lot of money to betray him.
b) If I had a dirty mind, I'd note that it's kind of kinky of them to be playing games in which she ties him down. But I don't. Not at all. Such a thing would never occur to me.
c) Samson is really stupid. Telling Delilah the truth the first time would have been understandable: incautious, but the sort of thing one could chalk up to being in love and hopeful. But telling her lies, discovering that she was passing those lies on to his enemies, and then telling her the truth is just bad OpSec.