Flashback (Excuses)

Why do people make excuses? Why not just be more up front? Instead of perpetrating a fraud and acting so busy in their life. Just say what's really going on. Is it not better to let someone down in the beginning; instead of dragging it out to the point where they will be even more hurt down the road when more feelings develop. Why do we always seem to be so busy in our lives when we are not interested in someone?