The Nine of Swords shows a person suddenly awakened in the middle of the night and appears to have had a bad dream.  We see this symbolized by the carving on the bed where there's a agressor with a stick in their hand about to strike a defenseless person on the ground.

In this image, the person is wearing white sleep clothes, white is symbolic of purity, innocence - it's doubtful this person, even if they are perceived as being "in the wrong", set out to maliciously hurt anyone.  In fact, it could be that they said what needed to be said but could be second guessing themselves now.  This happens many times in relationships when we see someone who needs help and we try to reach out to them.

If there are things on your mind that are causing you sleepless nights, this could be a sign that those things that are bothering you mentally should be addressed and resolved as soon as possible.