Eric understands that. To some degree, he felt much the same when vampires came out of the coffin. It was a relief to finally, after hundreds of years, own what he was. "You've done remarkably well in a short period of time. Not all vampires do as well."
Some can't adjust at all and they don't live long if that's the case. Eric wants Sookie to live as long as possible. "Then something good may come of this place yet."
He watches her smile go to anger and he expected as much. "You will be much safer both here and at home if you're 'mine'. You might keep that in mind."