When do u know its time to move on?

I like someone but he says he's leaving things to fate so he wants to focus on healing and self development and if its meant to be we'd find ourselves. I'm ok with it but I'm scared. I wanna wait but what if after he heals it isn't me he wants. I'll be stuck. So I'm thinking if I should just move on and I fear that if I do I may not look back. When I love someone I give my all and I work toward marriage. Its sounds like it's my understanding of self against he proposed fate?
When do u know its time to move on?
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