This is a bit weird but my girlfreind tossed this guy of ages ago but now im with her she won't do it to me?

Baisically my gf says she loves me and all the rest but she said ages ago she tossed this guy off and she won't do it to me, the guy she tossed off she said it was stupid mistake and she says she abit scared to do it to me? I know it don't really matter but I'm just curious