Sentence:  And you <WSD>know</WSD> you will always wonder all of your life whether it was because you wanted him so bad that you did n't get him , and you can feel nearly sorry enough to cry when you think of that other guy , the chump who begged you to marry him , the one with the plastered hair and the car he could n't afford and the too shiny shoes . 
Meaning of the word marked with <WSD> tags:  be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt