Sometimes you tend to think others should be as stable and predictable as you usually are, but other people just act irrationally at times. It can be disconcerting, but jumping to conclusions about their motivations may be a bit premature. The reason could be as simple as a bad (or good) mood. If you're truly concerned, just ask them if they want to talk about it. Their answer could end up surprising you.
Your birth chart is a map of the sky at the moment you were born. Download the Sun Signs app to find out how the planets’ positions influence your life.