Private
Whoa, okay. This is going to sound weird, but hear me out:
Somebody told me something like what you want to tell them. My boyfriend, the one who was from the future. He looked for me back in his time and I was- I was dead. It was really hard for me to hear. It made me question everything I ever did, and it seemed like every decision was made with that in the back of my head. I was obsessed with figuring out what happened and how to stop it; I skirted our rules because I needed to know. But during that time, I was so concerned with my future self's death I wasn't able to live my life. I couldn't enjoy anything around me, and it felt like all my choices mattered and were useless all at once. That they mattered because it might be the choice: The one that eventually set me on the path to death. But useless because the only criteria for them was whether they helped me live. Not if they made me happy, or helped me achieve my goals, or showed care to my loved ones.
Having been on the receiving end of that news, I really don't think you should.
And when I went back and tried to save my brother...
You can't change other people's choices, or their lives. I'm still coming to terms with it, and it's hard.