Never think you know what someone else is thinking or feeling, never make the assumption that you know based on what you think they feel. They may have had a rough night, gotten rejected, have a water leak in the basement, lost their kitten, found out their loved one is not doing well... all these elements play a big part in how we interact with others, it changes our energy levels and can inflict on our attitude. Never make assumptions that you know what a person thinks or intends with a certain thing. If you feel it's difficult to understand, if you feel hurt, if you are disappointed, make sure you ask them. Give them a chance to explain!