"when you're married, you'll realise that men with important work to do sometimes have to spend all their time and energy on their business. You'll have to get used to that, just as I had."[pt1]
-'You'll have to get used to that, just as I had' Suggests that Mrs B has also experienced MR B'S lack of affection during their marriage and the cruel, selfish gains of MR B. - warning to Sheila to not get attached to Gerald.