why did lola and yunior break up?

Yunior and Lola fall in love in this chapter, and Lola has Yunior promise never to lie. Yet, the readers already know that Yunior lives a cheating lifestyle, something that is considered very Dominican in the novel Even with Yunior trying his best not to be the person he knows he is and to be better for Lola, there is dramatic irony in the fact that his failure is inevitable.