How do I write about loving someone while also grieving who they are or could be?

This is one of the most honest things a heart can do, and it's also one of the hardest to articulate. You're holding two truths at once: presence and absence, joy and loss. Mirabai lived this constantly. She loved Krishna absolutely while grieving that her love couldn't be consummated in the way she wanted. She celebrated his existence while mourning the distance between them. Start by naming the specific contradiction. Not 'I love and grieve' but 'I love his kindness AND I grieve that he cannot hear me' or 'I celebrate who they've become AND I miss who they were.' Poetry lets you sit in both at once without forcing resolution. Use images that hold duality: a door that opens and closes, water that reflects and distorts, a name spoken aloud and then forgotten. Mirabai's genius was never pretending the paradox away. She didn't resolve it. She inhabited it so completely that readers felt both the devotion and the ache as necessary parts of one truth. Write one image that holds both feelings. Don't explain it. Let the contradiction itself be the meaning.