What should I do ?

There’s this girl who is so into my boyfriend and I don’t know what to do ..my boyfriend told me about this girl and I told him to cut off every connection he has with this girl and I don’t know if he’s did that or not but the last time I checked he told me he’s trying but this girl doesn’t want to stay away from him and I should give him sometime everything will be fine because he doesn’t want to lose me because of this issue..ladies what should I do