Why did this girl all of a sudden "friendzone" me/act distant?

So I've been talking to this girl for over a month now and up until about a week ago we would constantly text/call/flirt with each other. We met and went on a "date" (just grabbed bubble tea and talked) for two hours. I even got her a rose and a gift card on valentines' day which she even said was the cutest thing anyone's ever done for her. Then we were texting one day and she starts talking about her "major trust issues" and how she "wasn't down to date anyone right now" and how she's "lucky to have a 'friend' like me that understands her" and all that bullshit. Needless to say I was devastated because before this, all signs indicated that she was very interested in me and the attraction was definitely there. Since then, she's become progressively more distant to the point where she doesn't even bother replying to my texts/snapchats. I just don't understand where I went wrong? Did I go overboard with gifts? Maybe she's just not into me? Someone please tell me what I did that screwed everything up. I really feel we have a lot in common and we talked about anything we could think of. Just a short time ago she'd be the one initiating contact and blowing up my phone... now its like a complete 360 degree change and I feel really low..
Why did this girl all of a sudden "friendzone" me/act distant?
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