Tell F that you appreciate F. Be specific.
Share fun times with F.
Take an interest in F problems, though F will probably try to focus on yours.
Let F know that F is important and special to you.
Be gentle if you decide to criticize F.
Don't try to change F style. Accept F the way F is.
Reassure F that F is interesting to you.
Reassure F often that you love F.
Tell F that F is attractive and that you're glad to be seen with F.