Relationship obsessive–compulsive disorder
In psychology, relationship obsessive–compulsive disorder (ROCD) is a form of obsessive-compulsive disorder centred on relationship-related obsessions focusing on intimate relationships. Such obsessions can become extremely distressing and debilitating, having negative impacts on relationships functioning.
Obsessive-compulsive disorder comprises thoughts, images or urges that are unwanted, distressing, interfere with a person's life and that are commonly experienced as contradicting a persons' beliefs and values. Such intrusive thoughts are frequently followed by compulsive behaviors aimed at "neutralizing" the feared consequence of the intrusions and temporarily relieve the anxiety caused by the obsessions. Attempts to suppress or "neutralize" obsessions increase rather than decrease the frequency and distress caused by the obsessions.
Common obsessive themes include fear of contamination, fears about being responsible for harming the self or others, doubts, and orderliness. However, people with OCD can also have religious and sexual obsessions. Some people with OCD may experience obsessions relating to the way they feel in an ongoing relationship or the way they felt in past relationships (ROCD). Repetitive thought about a person's feelings in intimate relationships may occur in the natural course of the relationship development. However, in ROCD such preoccupations are unwanted, intrusive, chronic and disabling.
ROCD can involve obsessive doubts, preoccupations, checking, and reassurance seeking behaviours focusing on intimate relationships. Common domains of relationship obsessions include doubts regarding one's own feelings towards an intimate partner, preoccupation with the partner’s feelings towards oneself, doubts about the “rightness” of the relationship and preoccupation with the perceived flaws of the partner.
Relationship-centered obsessive-compulsive symptoms
A person may continuously doubt whether they love their partner, whether their relationship is the "right" relationship or whether their partner "really" loves them. Even when they know they love someone or that someone loves them, they constantly check and reassure themselves that it is the right feeling. When they attempt to end the relationship, they are overwhelmed with anxiety. Staying in the relationship, however, they are haunted by continuous doubts regarding the relationship.
Partner-focused obsessive-compulsive symptoms
Another form of ROCD includes preoccupation, checking, and reassurance seeking behaviors relating to the partner's perceived flaws. Instead of finding good in their partner, they are constantly focused on their shortcomings. They often exaggerate these "flaws" and use them to prove the relationship is fundamentally bad. The fact that they are unable to concentrate on anything but their partner's flaws causes the sufferer great anxiety, and often leads to a strained relationship.
Like other forms of OCD, psychological and biological factors are believed to play a role in the development and maintenance of ROCD. In addition to the maladaptive ways of thinking and behaving identified as important in OCD, Models of ROCD  suggest that over-reliance on intimate-relationships for a person's feelings of self-worth and fear of abandonment (also see attachment theory) may increase vulnerability and maintain ROCD symptoms.
Looking into Obsessive- Compulsive disorders there are certain symptoms that seem to become a common determination of the patient's disorder. Many obsessions come with fear. Relationship obsessions usually show signs of fear of either harming a certain someone, or even bringing harm upon themselves. People can often have symptoms of having a fear of contamination, a need for constant symmetry or exactness between items. More symptoms of obsessions revolve around sexual or even religions need constantly or fear of behaving unacceptably and even the fear of making mistakes. These are all common symptoms of obsessions, but obsessions can also link to compulsions. Compulsions usually symptoms are seen within the behavior and connect to that of an obsession. Someone who has a fear of contamination may constantly feel the need to clean or wash their hands. Someone who needs exactness or symmetry may feel the need to constantly check things or even arrange things. The obsession of the fear of making mistakes can have the behavior of always asking people for reassurance. These are all common compulsion symptoms, as seen they are often connected with the type of obsession seen. 
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