Katze is missing :(

I saw him on last Wednesday’s morning. He is an outside cat, but almost always comes home during the day to eat, sleep and just being around, asking to be petted and given kitty treats. Sometimes he leaves and doesn’t come back in a night or two at most, but it’s been almost a week. I am worried sick. I have put up posters, looked for him, contacted the animal’s home… I don’t know what else to do. He’s the sweetest cat ever, he loves being petted and purrs like a madman, so maybe somebody took him home, but since lately he was scared of strangers I don’t think that’s the case. Perhaps he is looking for females and hunting and just being a cat and all, but not coming home even to eat is so strange of him. I don’t know what to think, I miss him a hell of a lot, he is an awesome cat :(