I touched my girlfriend's belly button. Is it weird?

When she was sleeping on a bench, I realized her navel showing. Weird but I thought her belly button so cute. So I touched it and petted. I think it made her awaken. She put her shirt down quickly. Does she think I'm weird? Did she feel humiliated? ... What would you do girls if your boyfriend did it.
I touched my girlfriend's belly button. Is it weird?
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