Why does my un-neutered 1 year old male cat meow constantly?

My cat gets all the attention in the world, gets fed enough, and always has fresh water and a clean litterbox, yet- he meows constantly, We were previously watching a female cat, and now the meowing is worse! I'm figuring he's still a bit too young to mate, so I'm just not sure what it is and I... show more My cat gets all the attention in the world, gets fed enough, and always has fresh water and a clean litterbox, yet- he meows constantly, We were previously watching a female cat, and now the meowing is worse! I'm figuring he's still a bit too young to mate, so I'm just not sure what it is and I don't believe in getting rid of a pet if it's not causing any major problems, but if I don't figure it out- my family will reduce me to doing so...
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