When they feel compelled to modify their essential values to maintain this person's affection, they're in an unhealthy relationship.
When they stop laughing and every encounter with their spouse is stressful, they realize they're in an unhealthy relationship.
When they feel that the relationship is all about what they can provide you and they never receive anything in return, they're in an unhealthy relationship.
In an unhealthy relationship, people feel uncomfortable being themselves and pretend to enjoy things they detest, be fine, and be someone they're not.
They realize they're in an unhealthy relationship when they feel uncomfortable being vulnerable and sharing their genuine emotions
When you continuously complain and never thank them, they realize they're in an unhealthy relationship.
They realize they're in an unhealthy relationship when they'd rather be alone than with you because they feel like you're evaluating everything
They know they're in an unhealthy relationship when they feel uncomfortable telling you about their triumphs because you continually attempt to downplay them.