I have had similar experiences. Have been having things like that happen most of my life, but particularly since puberty.
As for the vision with the man, it could be precognition of some sort. Just because he's in a relationship now doesn't mean he will always be in one. It's been known to happen that former lovers reunite.
Or it could have been a glimpse into an alternative reality, of where you might have been, what might have happened. Or of what could still happen, given the right choices, etc.
The problem I've found with visions of this sort is that you never know until they happen. Sometimes that can be useful ("Ah, I dreamed this, this must be the right path!") and sometimes they really are not.
I could give a whole catalogue of dreams and visions I've had which later came to pass, but in slightly different ways than I thought they would (if I even thought they would). Most of the time, they have no purpose other than to be a little glimpse at some future event and when I get to it it's like, "Yeah, I knew this was going to happen" or similar. I wish my precognition was more useful, but it is what it is.
Anyway, I don't know how helpful that was to you.
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