Hello all. I need some opinions please. My DP works for a company for the past few months. They recently hired more people and my DP got close to one of them. According to my DP he is very helpful when no one else is, trustworthy etc. This has led to my DP oversharing with this new person, complaining about everything that goes wrong within the company, talking bad about their supervisor , you get the picture. I have as a principal that he should not trust so easy people who he barely knows but apart this the colleague has done some things that i find worrying. He told to my DP how the supervisor asked him to take over his role when he will quit his job( i can not believe this in a million years, the supervisor has no intent to quit and if he had i can not believe he would ask the new guy who works there for a month to take his place). He is also saying things that seem intimidating towards my partner. For example he was "joking" that the supervisor contacts him all the time and sends messages to the rest employees through him. He made sure to mention that he has no idea why he never contacts my DP, implying that the supervisor doesnt like him . He also mentioned to their boss things said in a personal conversation , work related and took credit for what my DP had suggested. When i tried to warn my DP to be more careful of this colleague he end up blaming me that i dont like it when he makes new friends and i am trying to find something wrong. Do you think i overreact ? And how i can approach my DP when he wont listen anything i say?