It seems this has nothing to do with whether you are compatible or not.
Here are the reasons, but there are more than three!!!
It might have been lust
More attractive options lure you
You aren’t ready for a long-term relationship
Lack of communication
You are afraid of being vulnerable
Comments from the peanut gallery. (That would be me, Laurie)
My Psychology professor used to say being single is a choice.
He said then go down to the local bar and hook up with someone.
I said I didn’t think I would find husband material there.
He said “case and point” you are then choosing to be single.