People that try to control your decisions, beliefs, and what you do are most likely concerned about what they want rather than what is best for you which is a strong sign of Overly controlling behavior.

Trust is an important foundation in any healthy relationship. A major sign of an unstable relationship is when partners, friends, or family members distrust you.

Physical abuse is easier to pick up but emotional and mental abuse can be just as damaging in the long run. Physical abuse, mental abuse, and emotional abuse can cause PTSD.

Codependency is a pervasive pattern that causes issues such as emotional exhaustion and increasing mental load. This happens when two people rely on each other exclusively for emotional, psychological, and even physical support.

a manipulation "tactician" is an insidious form of emotional abuse in which the manipulator will make you question your own sanity or judgments.

If someone in your life is negatively affecting your relationship with those you love that is not healthy and healthy relationships should never come at the cost of other healthy relationships with family or others.

demonstrates violence toward you, loved ones, strangers, and even animals is a serious red flag. It indicates they haven’t developed a healthy way to properly channel their emotions.

When you feel bad about yourself because of your partner constantly making hateful comments on your appearance, choices, and opinions or not turning things on you.

Where they ignore your problems, insecurities, etc

When your partner consistently cheats behind your back or even with you knowing and doesn't care. And tries to come back even after knowing what they did.

When they hide something from you or dont tell you certain things in a story.

when they touch you physically in a argument etc.

When they talk to you negatively and call you multiple slurs or bad things.

When your partner wants to do things you dont and keeps pushing to get what they want.

People with untreated mental health issues tend to someone who shows them any little affection which can lead to bad things.

when your partner isolates you from the things you want to do or people you hang out with because of physical attachment, jealousy, or hatred

When your partner could be ghosting or not communicating and then buying lots of things you like to distract you from what happened

When someone tries to change the way you look, and act for there personal need.

when they constantly dont talk to you for hours but when they do, act like nothing happened.

People with a poor relationship with other but has a good one with you tend to eventually have that same bad and argumentative relationship