The opposite of star-crossed lovers, those who are meant to be together but they are pulling themselves away, they are soulmates that completly deny it, either because they physically exes or they think they’re relationship is just temporary until one moves away.
“Its a shame Justin and Bailey broke up, they were perfect for eachother! But now they’re both cold and distant from eachother. Guess now they really are star-crossed exes.” (it is used as noun or an adjective)