some feeler is being cyber stalked by their brother. google lets you go through all your web history and export all the data google has saved on you (which is significant.) It's unlikely he has access to an old session that was still logged in as it would have prompted for a password for now. Though you can change your password, add 2 factor author, and then manually time out all the old sessions to be sure.

He might have also just been mind fucking you cause he knew you were suicidal already.