In relationship but crave a girl

Hayley
I've been in a relationship for 3 years and we have a beautiful baby girl, now 2 years old. When I was a teen I had a couple girlfriends and one really broke my heart. So once I settled down (with my now bf) I started missing being with a girl. 
My question is this, and I know finding this is rare. Has anyone ever wanted a best friend that's also your girlfriend? But you still want to keep your family first?
I've always wanted that special bond, with benefits, with a best friend. A safe place with love. Am I wrong for wanting that too?