As we know, Eicha is written in an אתבש style. This means that the beginning corresponds with the end, the next part corresponds with the second to last part and so on. The beginning of the Megillah talks about the loneliness and so does the very end. The next part talks about the sadness brought by the loss of the people and the second to last part talks about the horribleness of the destruction. The Megillah proceeds with this style.
        If the corresponding parts were exactly the same then there wouldn't be any growth or development through the sefer so obviously they can't be exactly the same. For example section א:א-יא matches up with section ה:יז-כב , but they are not exactly the same, or else we would not see the process ירושלים goes through. In the first section ירושלים is lonely because all of her friends have abandon her. Later, as ירושלים grows and matures she is lonely because Hashem left her
        They are similar situations but as the sefer goes on, the situation progresses and changes, but keeps the same root.
        An established Jewish belief teaches us that the way the calender works is not like a straight line that keeps going forward as time goes on, but rather, time is like a spiral. For instance, each Shabbat is a week later than the one before but when you look at the weeks on a spiral they are in the same place but one comes after, on the next loop of the spiral. This gives each Shabbat the same sanctity as all the others but they proceed each other so you progress but come back to a similar place. To expand, each Wednesday you are in the place, but since there is time between each you go up a level on the spiral.
       These two ideas, of the אתבש of Eicha and the calender spiral, seem to work very well together. Just as you come back to the same spot of the spiral but on a new level, ירושלים has parallel thoughts from beginning to end but as she grows, the ideas develop.

Same spot or  idea, on a new level.