Ok. It sounds like maybe she wasn't interested in anything romantic from the beginning, and once she realized that you were, she started to back away. Maybe it's as simple as working on the ability to distinguish between people who have romantic feelings and those who don't.
If playing games isn't in your nature then don't do it. "Playing hard to get" is a bit of a tricky one, though. On the extreme end it can mean a girl or guy deliberately acting like they're not interested just for the fun of the chase, but in a more common sense it can mean acting a bit flirtatious and subtle to express your interest in a non-direct way. In a way that's a game as well, isn't it, but it's basically a "mating dance" that most of us have to do in order to find a partner.
So practice being flirtatious, and go for girls who show a romantic interest. I mean that girl that you mentioned could have been a dude, given what you described. Chats at work and the occasional texts... I don't see how that sets her apart as something other than just a friend.

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