Don’t know what I did wrong?

There was this girl I was talking to, but it’s didn't work out. I’m here wondering if I pushed to hard or came off as too needy. At one point she was telling me she really likes me, and one point always said that she liked being around me and talking to me. So eventually I started to really like her and I told her on different occasions how I felt and so forth. In addition, I mentioned why not try. So she asked me to be patient with her. Up to a few days ago we would talk a lot, but since then it hasn’t been the same. We would still text, but its a lot shorter and less frequent. So im here wondering what did I do wrong, I thought everything was mutual. I know along the way there would be somethings I wouldn’t have done or said, but I just felt like I had to say it. Just need some advice.
Don’t know what I did wrong?
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