An unhealthy relationship has to do with abuse. Whether it be mental abuse, emotional abuse, or physical. The way they are spoken to, the way they are grabbed or the way the partner looks at them can all be clues on their relationship. Emotional abuse is exactly as it says, depression, suicidal thoughts, and emotions in general. Physical is hitting, tugging, yanking or even grabbed another persons arm is considered abuse. Mental abuse is being talked down to, degrading someone and many other things. EX: Telling another person they are worthless, telling them they are stupid, ETC