Very tricky! Take a look and help out? Thanks.?

Tell your brother he needs to let her go... I understand that you are concerned that the ex may be lying because he wants to ruin your brother's relationship but I doubt that! If he knew your brother's personal info, that means at some point he had access to it... He had the access because he's probably still sleeping with his ex... The situation isn't really a good one and if he's only been seeing her for 2 months, it's not really worth fighting for...