My boyfriend suddenly didn't call or text for a few days. What is the reason?

Not necessarily. I'm too busy when I have time. I always have time at night. You might have had a rest at that time, and I didn't want to disturb your rest, so I didn't call. If you are too busy to know what you are doing, try to send some words of comfort, and don't be suspicious. People don't want to be disturbed when they are bored. I can't tell you what you sent, but it was all sent in the absence of mood, so I will wait until he is free. Naturally, he has his reasons.