Identify physical and verbal abuse from your partner. Other than hitting and yelling, look for indirect forms of abuse such as throwing things, criticizing, threatening and undermining your self worth.
Assess what kind of lifestyle changes you have made for the sake of your partner. Giving up activities that you love, severing relationships with friends and family members and altering your belief system to suit your partner's are a few examples. Such compromises tend to affect your individuality in the long run.
Ask yourself if you are afraid to talk about certain issues in your relationship because it may upset your partner. A healthy relationship allows open and honest communication to resolve issues. A destructive one hinders expressing ones true feelings for the fear of ridicule, negative arguments and hurt.
Listen to what your family and friends say about you. If they suggest that you appear distant and withdrawn lately, you don't seem to be yourself or if you have to constantly defend your partner's actions, then you are in an unhealthy relationship.
Look for possessiveness and jealousy in your partner that stifles your freedom. These signs may initially seem like excessive love and care but a trusting relationship should allow the space and respect you need.
Consider a relationship destructive if there is a lot of emotional push and pull that makes you unsure about its strength. Being extremely needy or using sex to sidestep disagreements are indicators of a harmful relationship.