Hi,
my son’s 7 and his dad has been absent for 5 years (sporadic before that) we’ve had loads of questions recently, every day.
You don’t know what to say for the best do you. I think all you can do is explain in the most age appropriate way and make him understand it’s not his fault and nothing that he has done, some people just aren’t made to be parents.
I think the more you try and keep from them, the more curious they’ll be and will build this whole image of the absent parrnt that bares no resemblance to the real thing. Ive definitley found open and honest the best way.
Let me know if you want to talk 🙂