I am confused what should I do now?

So there is a girl in my office, we recently start chating via fb messenger. Things were pretty good in starting we share lots of thing and things were pretty good, but later conversation is getting very low and now its almost none, we haven't spoke since last Monday.
What I felt she is ignoring me now and I feel like what just happened all of sudden, totally confused.
she said earlier "we should not talk that much its not good"
Info : As she said she dont want a boyfriend and dont have a boyfriend too.
Any help would be great. Thnx
I am confused what should I do now?
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