i'll be straight with you, you're nver gonna stop hurting but you''ll find ways to cope. Just carry on with your life and make sure you make him proud. Giving yourself time to grieve is so important as the more you grieve the easier it'll be to heal over. If it helps carry something of his with you. if he had a watch or maybe a small picture of him it might help to know that he's with you and he's probably hurting to see that you're hurting.
You clearly had such a love for him that it''l take a while before things start to seem ok, make sure you open up to friends and family though. Don't keep to yourself. <3