Background: H had an affair, showed no remorse, said he didn't love me. Moved out. Told kids 'mummy and daddy don't get on very well any more'. Both DC seemed ok-ish after he left.
It's roughly a month later and DC1 who is 8, has been wanting to know exactly why daddy left and why he hasn't moved back in (H had sort of hinted he might). DC doesn't believe the original explanation, so I've tried to give an age-appropriate version (daddy was spending lots of time with another lady in the evenings, and you're not supposed to do that if you're married...).
Anyway, he's still not convinced and keeps on asking. Is there anything I can tell him that he would understand?