Search Results: he's talking to all my friends except for me

Basically, I got the idea from one of my friends who was pranked by his girlfriend. She tricked him into thinking he was really getting a PS5 by using an Instagram filter. I thought maybe it would be funny to do this prank on my sister, except that I'm doing it with a real PlayStation.

It was my sister's 15th birthday a few days ago. I got her a birthday present. It was a PlayStation 5. I wished her a happy birthday and gave it to her. It was actually the first time I got her something and she was really happy. She opened it and started talking about all the cool games she's going to play.

When she opened the box, however, she started freaking out because there was no PlayStation inside. I secretly took it out and replaced it with a 10 lb dumbbell weight. She asked me where the actual PS5 was but I couldn't help but laugh. I told her that she wasn't getting anything and that it was a prank.

She started crying and told me: "Thank you for ruining my birthday! I thought you cared about me, but I guess you don't." She then kicked the box and ran off crying to her room.

Was it really that bad a prank? Did I go too far? Should I apologize?

2 months ago, I got in contact with a crush I knew in the 7th grade (I'm in the 11th grade rn). She rejected me at that time. We don't stay around each other in person and we don't know where each other lives. But the first month we started talking over instagram, she says she remembers everything about me. More than I remembered about her. We texted, sent voice messages, called each other, laughed at stuff I said, and she tells me that she regrets ignoring me in middle school. Her and I have so much in common and we used to get flirty and talked about nsfw stuff. We're both introverts and we get really shy around the opposite gender. She even called me 'hun' after a compliment. We even talked about how we both got bullied sometimes and I would always push her to not give up on herself. Then she told me about how she only has 2 female friends and like 10 guy friends (including an ex) due to being slut shamed. Then she started getting more quiet. She even ignores my messages while she's deadass online 24/7. I honestly think she talks to other boys and maybe our flame died out.
Recently she ghosted me all last week and still today. Then she casually replies to me messages saying 'good morning' and 'i just need time to myself' and then goes quiet again rn. Not even considering me. I think my love for her is growing too fast.
How can I do this as well? I've gotten advice from my friends and the internet on how to move on from a girl, except im not actually moving on. I'm trying to worry more on myself until she replies to me. I don't know if she's really taking time to herself, talking to other guys, or playing hard to get (which is really unlike her), but I wanna be as thoughtless as her right now to avoid becoming desperate.

How do I learn this emotionless ghosting power?