"Friendly date" and "friendly flirt", what happened there?

One woman I met at my university and I went out with, told me we are on a date.
After few times I wanted to initiate more dates, she asked: "We are friends, right?".
I was like wtf. "You told me we are one a date then". And she replied: "Yeah, a friendly date". Another woman gave me mixed signals, and was jumping between yes and no with me until she started flirting heavily andSexually with me and then backing off. I thought it was push pull, but I figured out it wasn't, and I asked her what's going on. She replied that she is sorry, she wasn't thinking much and it was just a friendly flirt. Am I the problem or them? Is it a friendzone situation or they wanted me at first and figured out suddenly they don't? Am I not reading the situations right? Is it just me or those friendly date and friendly flirt are weird?
"Friendly date" and "friendly flirt", what happened there?
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