How can some guys be oblivious to signs of interest from their crush?

My crush apparently is into me since I’ve been noticing some signs and he also asked my brother some personal questions about me. All this time I thought he was an outgoing person, but it turns out he’s pretty shy and reserved. Sometimes when I talk to him on IG, if I don’t extend the convo then he just stops talking. I’ve shown him signs of interest such as flirting with him, asking to video chat, and I’ve asked him to hang out but he still doesn’t really act upon his feelings.

When I’ve flirted with him in the past he’ll just send me this emoji 🙈 and then talk about something else. When I suggested video chatting, he said he doesn’t want to do it and thinks he’s gonna look ugly and that he’s shy. So honestly at this point part of me wants to give up on him because nothing is happening the way I want it to go. I heard that some guys are literally oblivious to signs of interest from their crush, but how true is that though?
How can some guys be oblivious to signs of interest from their crush?
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