Can someone explain the ending to the movie "Keith" to me?

I understand how he helped her out of this shell she was kept in and whatnot but I just didn't understand their relationship in total. Why did he always keep blowing her off at the end and was a jerk but they kept getting back together and in the end everything seems alright after all of the rude remarks that... show more I understand how he helped her out of this shell she was kept in and whatnot but I just didn't understand their relationship in total. Why did he always keep blowing her off at the end and was a jerk but they kept getting back together and in the end everything seems alright after all of the rude remarks that were exchanged?
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