I found the following sentence in a fanfiction:
To think you would stoop so low as to become that girl's second husband.
I am thinking it's wrongly used, because the sentence is incomplete. What should the second part of the sentence look like? I am thinking there are multiple answers to this, could you give me a few example of how to complete this sentence. I am seeing people use the expression in a similar manner, but I feel it would only be correct if they put an ellipsis (...) after it.