How to forget a girl?(怎么去忘记一个女孩）

You should think something else or do something else.For example,you can do some sports you like or watch some movies or go out travelling.ALL these things can distract your attention.
The best medicine to forget someone is time.Maybe you can try to find her shortcomings so that you will not adore her.wow~,she is so common~I don't like her so much.
Hope you will be happy as soon as possible.