Why would he give me obvious signs that he's interested but when I made a first move he ignored me?

Reem12345reem

He really made it obvious , but I thought that he was shy to approach me , so I found his IG and texted him , but he didn't reply even though he posted 2 hours after I texted him , he ghosted me , so I blocked him

and after that he asked a pen from ME although he could have asked others but I gave him one bc I was in hurry ( and that' so rude , who ghosts someone and then asks them for something like nothing happened , i blocked him for a reason yet he still had the audacity to talk to me ) , and he was so intentional with every move he made (im not being delusional or overthinking im sure of it)

and he told his friend about it (I don't know if he told his other friends too but i know for sure he told someone )

Updates
8 mo
For the ones who are saying that he just acted nice and I thought he's interested, or I'm overthinking this than that's NOT MY CASE , I just didn't want to add more details bc it'll be long to read , so just answer based on what I said
Why would he give me obvious signs that he's interested but when I made a first move he ignored me?
11 Opinion