Delays in the brain of both parties I think. Underlying patterns and the full complexity of human beings and all that. I think there's very likely some unresolved commitment issues for Mr Di Caprio, stemming from the fact his parents lived next door to each other but were divorced and Titanic/Romeo and Juliet arrived to propel him to international and overwhelming stardom in his early twenties. These aren't excuses, they are observations. He should be finding attraction with women his own age but he appears not to be.... I suspect he doesn't know why or he does, but doesn't care.