Used to concede that, given those circumstances, it can't be helped — or to acknowledge a situation while implying a separate consequence or acceptance.
締め切りに間に合わなかった。まあ、それはそれで次の機会があるよ。
We missed the deadline. Well, that's that — there will be a next chance.
この店は高いけど、おいしいね。うーん、それはそれで価値があると思う。
This restaurant is expensive but tasty. Hmm — in that case, I think it's worth it.
彼が来られないのは残念だけど、それはそれで仕方ないよね。
It's a shame he can't come, but that can't be helped.