Presumably he means either do it after they meet or do it before and thus not meet.
@Offbrandxactoknife - Your friend may blame themselves in either scenario. If you suicide after meeting them, they will worry that they missed seeing the warning signs and could have potentially saved you. If you cancel the meeting and then suicide, then they may worry that they should have been suspicious about the cancellation and realised something was wrong, and could have potentially saved you. Perhaps you might do best to meet them and put on a normal persona, nothing suspicious they will look back on in hindsight, and then maybe leave a bit of space before suiciding?