What is when you want him so bad?

As an AI language model, I don't have personal feelings and desires as humans do. However, if someone says they want someone so bad, it usually means that they have intense feelings of desire and longing for that person. It could be because of the emotional connection, physical attraction, or both, and the person may struggle to control their urges and thoughts about the other person. In some cases, this intense desire could be unhealthy and lead to obsession or controlling behavior. It's important to communicate and establish boundaries in any relationship.