Who's in the wrong?

So last night my friend Lucy told me that these two people maybe getting together (Hannah and Damien) Hannah had just recently split with her ex and he seems to think that they are getting back together. So my friend Lucy said someone needs to tell her ex that she's getting with someone else so I told him . He then sent screenshots of our convo to Hannah and Damien. Damien is my bf friend and my boyfriend really doesn't like Hannah's ex as he's been mean to me before so I got a text in the night saying 'why are you messaging Hannah's ex?' I then explained to him why and he had a huge go at me saying I was being nosy and shouldn't have gotten involved. He refused to speak to me all of today. I know I shouldn't get involved but idk why my boyfriend is mad about it cos it has nothing to do with mine and his relationship