Hi Tracey, I know it's heart over mind but as much as you feel for this young cat,please be mindful of his health as he may bring to you Fleas,worms and other possible diseases and lots of heartache. Keep him totally seperate from your other animals and give him his own litter tray,feeding dishes etc,i know it's hard mentally and emotionally but until your told otherwise assume he is ill-i don't mean lock him up on his own but just like when your in a hospital ward Ask around locally ie:Vets,put posters or ad in local paper as he may just have forgot his way home and cats do go fair distancesGood luck Tracey with you on his side he'll be just fine i'm sureDo please keep us updated