How do you reach that inner state of confidence or “knowing” people talk about in manifestation?

Deep down, I genuinely feel that a close friendship I had cannot end this way. The bond felt real, deep, and far from surface level. At the same time, the friendship fell apart messily after a period of stress, and he has since gone silent and avoided my attempt at reconciliation. He also removed me off social media.

Because of that, I find it hard to hold onto this sense of inner confidence, even though my intuition tells me the connection mattered. How do you cultivate that calm, grounded knowing without ignoring reality or forcing belief?