Your personal life is just that. I would recommend what I have done in the past. I go to my employer before they come to me and explain that I am dealing with some personal issues that I would rather not talk about. I explain that although it is affecting me personally I will try my best to not let it affect my work. Then I apologize for any moodiness or slacking off.
I've always got understanding replies without having to be specific.

Hang in there!!
Heidu

The highest reward for a person's toil is not what they get for it, but what they become by it.
John Ruskin