The analyses of a text #2

The narrator recalls his adolescence.
His old nurse Pegotty's niece fled away with his best friend Mr. James, leaving her fiance behind.
Now Mr. James's servant is telling him the whole process of it.

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'At last, when there had been, upon the whole, a good many words and reproaches, Mr. James he set off one morning, from the neighbourhood of Naples, where we had a villa (the young woman being very partial to the sea), and, under pretence of coming back in a day or so, left it in charge with me to break it out, that, for the general happiness of all concerned, he was' - here an interruption of the short cough - 'gone. But Mr. James, I must say, certainly did behave extremely honourable; for he proposed that the young woman should marry a very respectable person, who was fully prepared to overlook the past, and who was, at least, as good as anybody the young woman could have aspired to in a regular way: her connexions being very common.'
He changed legs again, and wetted his lips. I was convinced that the scoundrel spoke of himself, and I saw my conviction reflected in Miss Dartle's face.
'This I also had it in charge to communicate. I was willing to do anything to relieve Mr. James from his difficulty, and to restore harmony between himself and an affectionate parent, who has undergone so much on his account. Therefore I undertook the commission. The young woman's violence when she came to, after I broke the fact of his departure, was beyond all expectations. She was quite mad, and had to be held by force; or, if she couldn't have got to a knife, or got to the sea, she'd have beaten her head against the marble floor.'
[David Copperfield by Charles Dickens]
1. I'd like to know what "it" refers to.
2. I'd like to know what "in charge with me" means.
3. I'd like to know what "to break it out" means.
4. And I'd like to know if "her connexions being very common" means "though her connexions are very common."
Thank you in advance for your help.