I have voice calls with my girlfriend for about 2 hours every night after about 10 o'clock. When we chatted last night, I joked that I was tired after talking for so long every day.

The joke you made is a bit wrong. How can you be so joking? You can't joke about this kind of thing. Go find a way to explain it. Otherwise I would be very angry. Love cannot be joked about. You said you felt so tired and she deleted you when she was angry. It was normal. You can say that talking on the phone every day is too tiring. It would be great if we could chat face to face. Let’s see what she says. It's also the time to test your love. She'll just be angry for a moment with a joke. Find a way to contact him, say something nice and admit your mistake, then things will get better. Girls are more delicate in their thoughts and words, but you have to pay attention to how deep or shallow it is. So let's find her through her besties or friends. It's not a big deal to buy some gifts and say nice things.