I'm going to cancel plans for a special date the day before
Why would you cancel plans for a special date?
I play it safe. It's not like cancelling plans is a big deal.
It is wrong to cancel on someone for no good reason. People might get upset with you if you keep canceling things with out a reason with other people.
It was a bad choice, I'm going to apologize to her.
I'm really glad you are gonna apologize. It's important to realize when we've done something wrong to someone.