My aunt... I don't know what to think of her

So my aunt is 45 and hangs with people like 20 years younger than her so she was hanging with a friend of hers and the gf decided to bring a guy, so it was my ex....
Long story short my aunt doesn't know why we broke up, but she starts to tell him I am just a free spirit and I'm absolutely over him and that he will be awesome for her friend, that they should totally do a one night stand, then I saw her today on Xmas lunch and she tells me all of this... 
I used to live with this guy so I feel a warm regard for him, despite that he behaved like an asshole to me but I don't tell my family what's up in my life, some part of me is happy he has found someone else, but most part of me doesn't need details.
I feel so annoyed because I feel she is being so disloyal and gosh knows what else she told him about me, then encouraging him to go with her friend... Ugh should I not be pissed?