Should I be bothered?

My boyfriend is reviewing for his mock exam
And just recently his exam had approached so he said he seriously need to review he will be busy so he won't chat me for days

I'm a bit sad but at the same time
I am trying to think that "ah this is for himself I shouldn't bother and this is something serious for him"

But my point here is a simple greetings of night and morning why can't he at least do that? Is he really that super busy...

But I trust him I'm doing my best to do other stuffs and be busy with work...
But sometimes it pains me.. i dont know what to do..
Should I be bothered?
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