Be kind to people when they do anything for you.
If somebody asks you over for dinner, no matter how the food tastes be polite and say it is good. You are not deceiving them. All you are doing is respecting all the effort they put into making this meal for you.
If someone helps you get to the airport, be thankful for their gesture no matter how horrible the ride to the airport is.
These are just two examples but doing so only makes them feel good about the effort they put in and build a better bond between the two.
FYI, I am not a relationship expert but this works for me.