Why is my guy friend behaving so weird? Or am I overthinking all the incidences?

Anonymous

So this guy is my friend whom I had crush when i was 16 but then we lost touch... now I'm 22 Unexpectedly one day he came to me and started talking first i was taken aback but i felt like we just talked yesterday it never felt like years of no communication... We talked and both had a great time... Then i kept seeing him he even smiled i was happy that things are not awkward anymore... But these days he is being too weird he talks but acts so nervous around me but i normal infront of other girls, he keeps staring at me and sometimes even twins his clothes with me i thought this is coincidence but one day i saw him wearing black and then in the evening it was red which i had worn since morning. Then he even holds the lift which he never did in years, he is always around smiling and staring, when i pass by his friends keep calling his name, one day i was alone with him in the lift but he just kept smiling as i said thank you, i wasn't able to press the fan button so he did it. Then he even helped my best friend (the one i thought he likes) like he never texted her but he did right before my birthday he gave her ideas and even planning to come for meet , even wished me but couldn't show up. I thought he's tryna be frnds so casually texted him that i met my friend but he was like ohh good And i ended up saying him that he is weird. He is a little introvert but still he expressed his disappointment but still keeps seeing me, helping me, tries to come close but never really talks. Should I talk to him or just let him be and can someone please tell me what these behaviour mean

Why is my guy friend behaving so weird? Or am I overthinking all the incidences?
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