If you husband is your BF. I'm not saying its not ok but really you don't have an actual best friend? I have 2. Both I've known for years and both who are the most awesome friends ever. How is your DH your only best friend?
Edit for woman with dh bf syndrome: Its fine if your dh is one of your best friends and I never said otherwise but I think having a separate bf from your marriage is better than only having your dh as your bf.