Husbands reconnecting with an old female friend

my husband added this girl online and messaged her stuff like he's missed talking to his best friend, he didn't hide it and didn't care I saw it, but it really hurt my feelings, I just feel it's inappropriate to have a "best friend" who's female when you're married, your wife should be the only best friend who's female. He said he wants to invite her (who I've never met) to the baby shower he wants to throw for me, I just feel jealous that another girl has his attention other than me. I trust him 100% but being a girl.... I don't trust them at all! People reconnect all the time and get feelings.. Being 25 weeks makes me feel unattractive and he knows how much it all bothers me and he told me told me today they have been catching  up today and talking about the party... I feel like my feelings are just irrelevant. What would you do? 

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