If he says this to me, what exactly does it mean?

My boyfriend broke up with me today and said this to me when I asked him how he truly felt and he said:
"I can’t tell for sure whether or not this time apart will convince me that I am healthier/happier without you"

I'm having a hard time understanding what he means by that. Does he mean he doesn't know if time away from me will convince him that he'd actually be happier without me (meaning he thinks he won't be happy without me) or does it mean that he thinks time could possibly make him realize he can be happier without me?
If he says this to me, what exactly does it mean?
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