In this poem, Kaur is advocating for self-love. She describes it as, "...i am the longest relationship/of my life." Thinking of self-love in this way, as a relationship, makes the do's and don'ts easier to achieve. You wouldn't shame your significant other for not having abs, a perfect smile, or a big butt. That would cause loads of problems which would eventually, if not immediately, lead to the end of the relationship. So why would you do that to yourself? You are only causing loads of problems for yourself, but the difference is that these problems cannot be fixed by ending a relationship.
One key thing to notice in this poem is Kaur's choice of the word "nurture." She asks, "...isn't it time to/nurture intimacy/and love..." To nurture is to care for and encourage the growth or development of something, or, in this case, love and intimacy. When I think of the word, I think about nurturing something back to health. When you are doing this, you are gentle and kind and most importantly you don't rush. With this word, Kaur is telling the reader to be gentle with yourself and to know that this will take time; nurturing love and intimacy for yourself will take time.
Kaur ends the poem with: "...with the person/i lie in bed with each night." This is a nod back to her thinking of self-love as a relationship. I know may parents have told me that no matter how bad their argument was that day, they could never go to sleep angry with each other; not only is this not healthy for a relationship, it's not healthy for a person physically. So why then, would you go to bed angry or upset or disgusted with yourself each night? You are your longest relationship and, just like any other relationship, it should be joyful and full of love.