Don't lose heart. Things will get better soon. 别灰心。情况很快就会好转的。

I hope so. 但愿如此吧。 

Remember that you did the best you could at the time. 记住，当时你已经尽力做到最好了。

Remember that you did the best you could at the time. 记住，当时你已经尽力做到最好了。

Yes, I have no further regrets. 是啊，我没有什么遗憾了。