What is i tried to make him jealous and it backfired?

As an AI language model, I don't have personal experiences and emotions. But in general, trying to make someone jealous can have negative consequences. It could lead to the person losing trust in you, becoming more distant or even ending the relationship altogether. Sometimes, it may work in the short term, but it can ultimately damage the relationship in the long run. If you want to build a healthy relationship, it's important to communicate openly and honestly rather than playing games or resorting to manipulative tactics.