The car broke down, the movie was a snoozer, the place you wanted to go out to eat at got closed by the health inspector one hour before you arrived.

All of this you can handle except for the fact the person that you were really anxious to go out with turned out to have the personality of a fried lobster; which is an insult to fried lobsters everywhere. 

You have made up your mind that you are definitely not going out with them again.  But as Myrna Loy said in the movie The Batchelor and The Bobby Soxer, “Don’t sulk about it.” 

In other words avoid any self  pity or overanalyzation.   Force  yourself to get involved with other activities.  Getting active is a great way to truly put the bad date experience behind you.

Things happen in life and a rotten date is one of them. Forgive yourself and your date and then move on.