There was some compromise that happened and she broke up with him, and he probably went with Karin. He prob. came back like "yooo... lol" and she was like "whatever *****"
or it could've been she got cheated on.
Or, it could be the DNA test was a hoax/ not 100% true (as they always aren't) and Sarada had to be born through Karin because Sakura couldn't have children for some reason.
or it could've been she got cheated on.
Or, it could be the DNA test was a hoax/ not 100% true (as they always aren't) and Sarada had to be born through Karin because Sakura couldn't have children for some reason.