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What Cary said. I think she goes for drinks with you because you are her friend and she likes you. I think she told you she wants her husbands babies because she's in love with *him* and was subtley sending you a message. She probably got the vibe that you are into her, and she was making sure you didn't get the wrong idea about your friendship.
Friends only! Don't make it wierd by pursuing her, you'll just lose a friend.
Have you thought about dating? Like, other people? You should, if just to get out there and practice. You are probably a really great guy lots of women would want to date, so forget about this co-worker, take a cold shower and get back out there! Cheers