"gay guy with husband"

Ok so I have a gay friend he's married. I love him to death, he's the sweetest guy you will ever meet and always there to boost your confidence and make you happy, but lately it seems he's been flirting with me.. ( im female) example: " hey sexy, your so hot, your bf is lucky to have such a sweet girl like you, I miss you, I want to hug you, ect. Now it's totally normal for a guy to flirt with a girl but I feel guilty he has a HUSBAND and if he sees that he may become really insecure and I don't want him to think we have something going on cause it's not like that. Is it normal for him to talk this way or does it seem a little odd?