Dear Queenie,
I was seeing this man for a couple of years, but not anymore and now he is seeing another woman I happen to know fairly well who knows he was seeing me before her.
Queenie, how can this slut do something like that to someone she knows? How would she feel in my place?—Ex-girlfriend
Dear Ex,
Why is this other woman any more a slut than you were for “seeing” this man? Unless he made some kind of commitment to you that you did not mention, he has every right to “see” anyone he chooses and so does she.
Get over it (him) and find someone new.
