Hi For About A Month Now, My 6 Year Old

Hi for about a month now, my 6 year old son cries when he's at home. His reasoning is when he's bored he misses me (Mom). I am getting questions about why do I have to be at work all the time, why can't I be home more. I've always worked long hours (this is nothing new). He looks sad sometimes likes he's over thinking. I've told him when he's bored he should read, but he is still in the beginning stages. His teachers say he is great at school. There are 3 other kids in the house after school (19, 17 & 12 years old). Your thoughts...very extra clingy more than usual.