Well first of all, tell your best friend about it, as long as she's trusted. If shes all right with it and he likes you back, go for it. but be careful coz if you to break up or he doesn't like you back, that could start a fight between you and your best friend!
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Look for signs such as frequent communication, eagerness to spend time together, asking about him, or showing interest in activities he enjoys. Additionally, if she compliments him often, seems nervous or blushes around him, or goes out of her way to help him, these may indicate that she likes him.
When you keep catching him looking at you or he suddenly starts acting like a dork when you're around or starts ignoring you.
She will probably talk about him a lot arising you, and/or ask to hang out with him and/or tell you or him