Be a good friend and complete this urgent text message to stop a late-night mistake.

I know you miss him, but you really _____ your ex at 2:00 AM. Put the phone down and go to sleep!

The correct answer is shouldn't message.

To give negative advice, we use "should not" (or the contraction "shouldn't") followed by the base form of the verb. We do not use "don't" with modal verbs like "should."