Obsessive and controlling people can be difficult to interact with. Many people suffer from personality disorders with a large number of them never addressing the issue. They learn to compensate in a way that hides their behavioral challenges commonly observing and mimicking the relationship behavior of others.
This sets them up to appear wonderful when first meeting and getting to know others. The problem being those who copycat human behavior don't actually feel empathy for others. They are hyper sensitive to their own feelings and desires later displaying narcissistic behavior.
This makes it very difficult for them to interact with others in an intimate or nurturing manner. This reality creates many a painful and defining moment in the lives of others. Take heed to be careful and deliberate when really getting to know someone.