What should I do if my crush hugs my friend from the behind?

Anonymous
What should I do if my crush hugs my friend from the behind and puts his face into her neck. She just let's him and usually he does these things to her when I am not around. Plus I haven't told him that I like him by I pretty sure he knows because he only does it when I am not around. What do I do???
What should I do if my crush hugs my friend from the behind?
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