My penpal didn't reply me for a 4 days. I'm anxious to know why

here are a few possible reasons
1) he got freaked out by my last letter, which i wrote when i was feeling emotional X(
2) he couldn't get access to a computer. His laptop is spoilt so he has to use his sch's comp room. Bt since he stays in his sch campus, shouldn't it be easy for him to go to the comp lab?
3) he's got the flu so he can't go the the comp room. But he was sick since tues. Shouldn't he have recovered by saturday?

Arrghhhh i just gotta know what happened to him!!! Even if he doesn't want to mail me anymore, at least tell me why!!