Why would a girl giggle when I give her compliment?

andre-48

All I said was " it's a nice bike you have here". This girl giggled after I said that. This was during the moment when I saw the girl I like fall off her bike. I was driving behind her as she was pulling out of the driveway. She had fallen off so I pulled over and got out of my car. I went to make sure she was ok. Once she was ok and we were talking about how she fell off I said " the important thing is you are ok, on lighter note that is a nice bike you have"

Why would a girl giggle when I give her compliment?
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