Reasons Someone May Breakdown Over Small things

Their past trauma has been triggered.

They are overtired. Not getting enough sleep night after night can wear down one's ability to manage emotions.

They are exhausted from pretending to be okay.

Taking on too many responsibilities at once or even agreeing to too many social activities is a surefire recipe for feeling overwhelmed.

They are in an incredibly anxiety induced situation.

They are dealing with extreme relationship stresses. Allowing conflicts to fester typically makes them more stressful, not less.

Don't label people as dramatic or being weird. You have no idea what someone is going through in their life.