you have been able to point to the why factor " I am such a jealous person/so insecure. "
That is why you're having hard time accepting the fact that he has female friends. Couple's counseling and individual counseling can help you sort this out.
You really want to nip this problem in the butt because he may start feeling overwhelmed by your reaction and feel turned off. If he is faithful and you know that his interaction are just friendships, then work on the feelings you've got (those of insecurity and trust issues)
Check out this book -
~ Carl G. Hindy Carl G. Hindy (Author) › Visit Amazon's Carl G. Hindy Page Find all the books, read about the author, and more. See search results for this author Are you an author? Learn about Author Central (Author), J. Conrad Schwarz (Author), Archie Brodsky (Author)