In this line, the persona experiences inner conflict and attempts to handle her emotions.
Firstly the first line says "I'm sad again" In this line, I can infer that the speaker is experiencing sadness and may be in a cycle of it. This shows that the speaker may be having trouble suppressing her emotion and coping with it.
In the next line "don't tell my boyfriend" the speaker uses irony and foreshadowing to show the complicated relationship she has with him. Irony can be seen being used here by how instead of seeking help from your lover or in this instance her boyfriend the speaker doesn't want to seek help from him, this shows the disconnect in the relationship and foreshadows potential tensions and complications due to how the writer and possibly her lover does not want to be open with each other.
However, in the last line, she quotes "It's not what he's made for" shows how the writer finds that her boyfriend isn't someone to look for emotional help. Symbolism can be seen here in how the writer also objectified her boyfriend this can be seen in the words "made for" This means that the writer could have been possibly objectified so much that when it comes to her boyfriend, who you would think is someone who makes you happy and keep your vibrant, the writer starts to think her boyfriend is also like an object, she thinks that her boyfriend is someone who makes her happy only, instead of someone who keeps cares about her and is willing to give emotional support.