My guess is if you can see it in their face. I can always see if somebody is pretending to like me. I can see it in their eyes and face. And you can always ask his friend or your friend to really find out what hes hidding. I hope that helps!:)
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If a guy pretends to like you, he may show inconsistent or insincere behavior, such as not following through with plans, sending mixed signals, or avoiding deeper conversations. Trust your instincts and observe if his actions match his words to determine if his feelings are genuine or not. Communication is key in these situations, so it's important to have open and honest conversations to understand his true intentions.