How to compliment your boyfriend<br>Compliment his face. Your boyfriend's face is an important part of what makes him who he is. By complimenting his eyes, smile, or overall handsomeness, you can let him know how attractive you find him.
When you compliment your boyfriend's face it shows him your true feelings.
There is no way to know your true feelings.  Just because you give someone a compliment doesn't mean your truly feel that way.  I am not sure why the system got it wrong.