why is he acting like this? pls help a girl out🙏

I’ve been dealing with a guy who is SO confusing i swear. he's 100% interested in me and ive even heard about it from his cousins but REFUSES to speak to me. I can also tell from his super obvious body language. for example, he NEVER and i mean NEVERRR keeps his eyes off me, he's always around me, his friends act different around me, and he's always fixing his hair around me. Besides body language and 24/7 eye contact, i never get signs of interest from him. It was my birthday recently and he never even said happy birthday, knowing very clearly it was my birthday with all my friends posting me and almost all my social media apps he follows me on telling everyone it is my bday. i cant even get a hello from him. ive come to the conclusion that he’s just shy and nervous around me but i just dont understand why. On my part, ive tried to initiate conversation with him MULTIPLE times and ive gotten a response from him before but it never turned into a conversation. i dont know why he doesnt talk to me or try and start a small conversation with me even though ive tried. is he just that nervous or does he not like me and im just delusional?