The sentence can have several meanings depending on how a person chooses to see it. Two sentences explaining the meaning of the pun in this sentence are given below:
Pun is the humorous usage of a word in order to make use of its several meanings. Pun is a way of playing with words.
In the sentence above, the speaker plays with the word pizza as a replacement to the word, 'place'. When sharing pizza, it is usually divided into parts.
In the same way, the person who the speaker was referring to occupied a place in his heart.
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