My Portia's papa took that friendly and hospitable bill back to the Bank of England and cashed it; then the Bank canceled it and made him a present of it, and he gave it to us at our wedding, and it has always hung in its frame in the sacredest place in our home ever since. For it gave me my Portia. But for it I could not have remained in London, would not have appeared at the minister's, never should have met her. And so I always say, "Yes, it's a million-pounder, as you see; but it never made but one purchase in its life, and then got the article for only about a tenth part of its value."
这里的But for it I could not have remained in London, would not have appeared at the minister's, never should have met her是对已发生的事情作相反的假设,过去虚拟吧?
另外,这里的never should have met her 和 should have never met her 或 should never have met her 含义有区别吗?