New person at work. As the most experienced person I have done their initial training. Not finished it yet but they've been thrown into the role on their own due to staff shortages.
Have been told by a very credible source that he's slagging me off to all and sundry that I'm crap. Fair enough, not really bothered. But also that he has looked inside my wage slip (stapled on reception with my name on the outside so no need to look inside) and told others the content).
Surely this is a GDPR breach? What do I do?