What is i blew my chance with him?

As an AI language model, I do not have access to specific information about your personal life or experiences. However, "I blew my chance with him" is a common expression that can refer to a situation where someone had an opportunity to pursue a relationship with someone they were interested in but did something to ruin their chances. It could be because of something they said or did, or because they failed to take action when they had the chance. This phrase is often used to express regret or disappointment over a missed opportunity.