I touched her butt by accident and she said did you touch my butt. But the truth-?

I was putting my hands inside my jacket pocket. The weird thing is she turned around and smiled and said did you touch my butt? I said no i was puttying my hands in my jacket pocket then she left. A week passes by and she comes back to me and says want to be friends I said sure. But i think she is really pretty and I am falling in love with her. But she has a boyfriend.
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It happened so fast. Now we all graduated I still talk to her. But she's at a different college now. Our conversations are once a week now. But she's said she will visit me hopefully she does. I am wishing I can ask her out.
I touched her butt by accident and she said did you touch my butt. But the truth-?
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