You did everything you could for Montgomery. Your heart wrapped around his and his around yours. You are forever bound by the love your shared and the fight you gave for him to live. He is with you always, happy to have had your help and that of the vets who eased his pain. Never forget you rescued him from a place of a lonely, cold and painful death and gave him the most peaceful one he could have had. You were meant to find each other and your short time together was fated for reasons we may never understand. Above and beyond all, you gave that sweet baby the love he'd been denied that he deserved.
Take your time in your grief, find peace and strength.