Is my girlfriend being condescending?

I am confused??? I am a young adult who usually doesn't have trouble getting dates, however I always seem to have a problem with texting women that I am dating. It's hard for me to tell when they're being condescending.
My current girlfriend will send me replays saying things like "Oh, that's nice", "Oh, Okay." She also says "Wow" a lot. I know that usually someone does that to end a conversation, however after doing this she will usually ask me a direct question, which is done to continue conversation. So I asked her one day if she enjoyed texting with me, she told me that if she didn't she wouldn't respond at all.
Why can't women just be straightforward and say what they mean, like men, instead of playing confucius mind games. It's so incredibly frustrating. When ever one of my buddies texts me always know exactly what he means and is talking about.