While reading a poem I usually break the lines in poems by reading each stanza. 

I realized I was right but not completely, there is more to it then just stanza's and there is also a certain way to break up the lines in poetry in a more proper form. Some of the best poets ever use several techniques of style to conduct their poetry. Four important style choices available to poet's are stanzas, line breaks ,syntax or sentence structure or sentence variety, and grammar of a poem. The stanza in free verse is a way to organize related ideas, a way to create a pause, a way to add emphasis to related lines. A line break is a tool that the poet uses to create a particular effect, such as a pause or to emphasize an idea, word, phrase. A good understanding of syntax or sentence structure will help you write better poetry. Sentence structure contributes to the rhythm of a poem. The best poets follow the rules and conventions of grammar. They use the active voice, write with concrete nouns and actions verbs, and use adjectives and adverbs sparingly. Reading poetry well is part attitude and part technique. Curiosity is a useful attitude, especially when it’s free of prejudged ideas about what poetry is or should be. Effective technique directs your curiosity into asking questions, drawing you into a conversation with the poem.