How do I deal with my loud cat?

Here's the problem: He became spoiled because, when he got depressed from me giving my other cat more attention, I started to give him too much attention. I also just started working full time and my cat isn't used to that. Now he is constantly meowing loudly when I'm not paying attention to him. I know the way to fix it in most situations would be to completely ignore him (not punish him or even look at him) when he's meowing, and cuddle with him and give him treats when he's quiet. The problem is, every time he's quiet for a while, I go and cuddle with him for a long time, and as soon as I stop, he gets up and starts meowing annoyingly again, and then settles down in about ten minutes. Any idea what I should do? I'd like to fix this as soon as possible. We live in a duplex and just got a new neighbor and this is probably driving him crazy.