Found a number in bfs wallet

So its his old managers #. He was at that job for about a week and his friends work there as well! He worked there about a month ago. I've been having a weird feeling and had to follow my instincts, and found my instincts were once agaim correct. The worst part is it was hidden or place very discreetly in between all of his cards and its written on a post it note. Don't really know how to bring it up because I was creeping, don't know what to think or how to act I've found 2 girls numbers in his notebook too before. I'm So upset and hurt and angry can't think straight Pleaseeee help! Thanks .