Screenshots last longer than friendships. Type like the message could be shown to anyone.

Written messages outlive the mood they were written in. Somebody you trusted completely at fifteen may not be in your life at eighteen, and the conversation sits there exactly as sharp as the day you sent it. That needs no betrayal to happen, only time and a borrowed phone. Writing with it in mind is not paranoia, it is remembering that text is permanent while feelings are not.

Before you send something cruel about a third person, say it out loud to a friend instead. If you would be embarrassed to hear it read aloud, it probably should not be typed.