A lot of times one who is prone to unhealthy love relationships on a continued basis in adult hood, have had a lot of broken relationships that have lead to this habit. Not with just specific boyfriends or girlfriends. Those who've had troubling relationships with their parents, brothers, or friends close to them can develop obsessive traits later in life. Obsessive relationships have a pattern for a reason. If you've never been able to establish a close, and loving relationship that has lasted in your life, then you might be prone to developing unhealthy love habits in relationships.