You don't say if you want him to be or he is or how to help that along. In my opinion your husband should be your best friend and you his. This isn't to say that you don't still need a girl friend to talk certain things over with.
yes as long as the husband or wife knows that they have been best friends forever
just treat her the same as you would your friend just better. talk about anything you normally talk about. The best and longest relationships are couples who are friends and lovers.
You'll make better friends than lovers.
Exaclty how you be friends with a boy
say will you be my friend
his girl friend
if its a girl friend; amica if its a guy friend; amico if its a group of friends (masculine or a mix of girls and guys); amici if its a group of all girl friends; amiche
this is kind complicated does your friend like this girl too? if not then try and ask her out...if yes then ummm...
That you want to be more than friends with them, that you want to be boy friend/ girl friend with them:Sx
When his girl friend calls be polite but not to informative.
Friends are friends and if you like this girl then it does not matter if this girl is an ex of your other friend, but be sure to let your other friend know you are seeing this girl and why. When you are with the ex girl try not to discuss the relationship she had with the other friend and just enjoy each other.