strength of oxytocin

While reading chapter three I was interested in the hormone oxytocin. Which is a hormone that is responsible for reproductive functions like child birth and breast feeding. It also plays a significant role in maternal and romantic love creating strong bonds between relationships. From this information I started to wonder can a high amount of oxytocin released from the pituitary gland be dangerous?
The reason I wonder about this is because my fathers friend killed himself over a bad break up from his girlfriend. Therefore I went searching online for more information about the strength of oxytocin. I found a video that that shows a prescription of oxytocin created to help couples reunited romance and increase trust (http://www.youtube.com/watch?v=U896FX3YiOE). This video proved that a increase in oxytocin strengthens the bond between two individuals. Thus to much oxytocin can form a strong romance that may make a person feel they can not live without their significant other.