Oh Trace, you really don't need this XOXOXOXO

I'd be more inclined to call his friends parents, if you know them and put them on alert. Call the school and ask for a councellor to be made available.
It must be very hard for him to process the loss of Milana.
Did you explain the to the police about Milana? If they knew he just wasn't another rotten teen runaway late for dinner - but a child in severe pain they may be more compassionate.

Darling, I may be wrong but I get the feeling he may want to stay away from you so you don't see him cry. He may not want to upset you more. I dunno. The poor kid. Poor mummy.
xoxoxoxo