You should always clearly communicate your feelings with others.
Selena just ate a terrible casserole that her boyfriend cooked her for dinner.
Selena wants to thank her boyfriend for being thoughtful and giving.
Selena tells her boyfriend that she appreciates him cooking her dinner, but tells him that she didn't really enjoy the dish he made.
Selena tells her boyfriend that she appreciates him cooking her dinner, then says it was delicious so as not to hurt his feelings.
The next time Selena's boyfriend cooks her dinner, he prepares tacos, which he knows she enjoys.
The next time Selena's boyfriend cooks her dinner he makes the same casserole, believing she really enjoys it.