So you are going to tell me that a girl who hung out with a guy and they held hands and kissed when they were 18. After they both mature a bit (not everyone who is 18 is very mature). He gets married (and she gets married) both to other people.
He becomes a real Ba’al habyis is she becomes a real ba’als Habusta.
But because they engaged in holding hands and kissing when they were 18, He gets Karis and no matter how many times he keeps shabbos , Learns Daf Yomi, Gives Shiurim or anything else he does. He is cutoff from the rest of Jewery.