"I believe that when you're in love you have to pour your heart and soul out to your partner... or why bother? So in that sense I'm an incurable romantic when it comes to men"

Cameron Diaz is expressing her belief that when you are in love, you ought to be open and truthful with your partner. She thinks that if you are not happy to put your heart and soul into the relationship, then it is unworthy having. This suggests that she is a romantic person who is willing to invest her emotions into a relationship. She is also suggesting that she is an incurable romantic, meaning that she is always trying to find a romantic connection with someone. This quote shows that Cameron Diaz is an individual who values relationships and is willing to put in the effort to make them work. She thinks that love ought to be revealed honestly and truthfully, and that it should be treasured.