Cleo, I am sorry that your cat has not been around for 2 days, but you need to be proactive if you want to get him back.
When a cat gets out, they become disoriented in their surroundings even if they can see you and you see them. Even if they are domesticated.
You need to call him and he needs to hear your voice. You need to call his name morning and evening so he knows you are looking for him. To just sit back and grieve is not an option. Walk up and down your street shaking the bag of treats or dry food as well as making the sound of opening up the can.

Have you left food around your home and called animal control? Have you put up posters for your cat? Even if he is an outdoor cat, you still need to do this. You should put things of your scent around your home as well.

best of luck.