Try reading up on codependency
Wikipedia - "Codependency does not refer to all caring behavior or feelings, but only those that are excessive to an unhealthy degree.[18] One of the distinctions is that healthy empathy and caregiving is motivated by conscious choice; whereas for codependents, their actions are compulsive, and they usually aren't able to weigh in the consequences of them or their own needs that they're sacrificing.[citation needed] Some scholars and treatment providers feel that codependency is an overresponsibility and that overresponsibility needs to be understood as a positive impulse gone awry. Responsibility for relationships with others needs to coexist with responsibility to self.[19]
Codependency has been referred to as the disease of a lost self.[3][20] Codependent relationships are marked by intimacy problems, dependency, control (including caretaking) denial, dysfunctional communication and boundaries, and high reactivity. Often, there is imbalance, so one person is abusive or in control or supports or enables another person's addiction, poor mental health, immaturity, irresponsibility, or under-achievement.[21] Some codependents often find themselves in relationships where their primary role is that of rescuer, supporter, and confidante. These helper types are often dependent on the other person's poor functioning to satisfy their own emotional needs.[2] Many codependents place a lower priority on their own needs, while being excessively preoccupied with the needs of others. Codependency can occur in any type of relationship, including family, work, friendship, and also romantic, peer or community relationships.[22]"