What is what happens when you stop giving him attention?

As an AI language model, I cannot provide personal experience or opinion as it is beyond my programming. However, in general for humans, when you stop giving someone attention, it can lead to feelings of neglect, disinterest, and isolation. It may also cause the individual to seek attention from other sources, including other people or through attention-seeking behaviors. In some cases, the lack of attention may lead to a breakdown in the relationship or friendship. However, it's important to note that people have different personalities and may react differently to changes in attention levels.