AITA for telling my brother's girlfriend what he was planning to do before he passed away?

My (M17) older brother (M26) passed away 3 weeks ago in an auto accident. It was devastating for the entire family though he was low contact with them for minor disagreements. His girlfriend was the one devastated the most, She didn't eat or take a shower for an entire week. My parents took her in last week because she could no longer afford rent for the apartment she shared with my brother.

Here's the situation, before my brother passed away, I think this took place a month ago. He confined in me his problems with his girlfriend and said he was planning on breaking up with her next month (Jan) I thought that was too much for his girlfriend since she'd always been the one to try to work things out but my brother had issues.

Seeing his girlfriend depressed to the point of losing weight and hearing her break down crying multiple times a day, I decided to sit down and tell her what my brother was planning on doing. I didn't just dish it out on her, I just told her what he told me but she reacted in a very negative way, She had a break down crying and screaming at me. My parents came rushing asking what was happenning and I told them after my brother's girlfriend rushed upstairs. My parents berated me saying I should never have said this to her seeing how breaved and struggling she was. I explained that I felt bad for her and didn't think it was fair for me to hide this important truth from her. They told me i had no right and this was not a good timing...also said that I just made it worse and tainted my brother's memory for her and confused her even more. I got punished harshly but my friends agreed I did the right thing since my brother's girlfriend's situation is just tragic and she needed this piece of info and I was right and considerate to give it to her.

I really think I just let her know this because I felt guilty for hiding the truth from her but I might be TA for what I did.