We’re even, and just wipe the slate clean and no guilt and no responsibility.
not evenは「まだ〜ない」、We’re even だと「お互い様、イーブンだ」
The slate could be wiped clean.
That slate’s never going to be wiped clean.
slate
昔の学校で、生徒がメモをとるために使った小さな黒板
大きな黒板はcholkboard