Slowly, She Radiates

Very nice piece you have here! I hope you don't mind me taking it apart bit by bit to critique it. I only do this for something I consider worth it, so be flattered.

"Slowly, she radiates as she sees that the depression she sinks in is ridiculous. Like a flower, she opens to the sunny idea that she will move on. Nostalgia, her enemy, constantly pushes her to the ground as she tries to fly. Loneliness haunts her forever which makes her learn more about herself day by day. She seeks company who are never constant, who say they are her friends. Breathing in refreshes her and reminds her that she is alive. The depression is a repetitive negative sensation biting on her flesh. It wishes to drink her dry so she'll commit suicide."

Line 1: This sentence is very awkward in structure. It made me confused as to what was going on. THIS IS YOUR OPENING LINE, MAKE IT STRONG! Not shouting at you, but I need to emphasize that point. You don't want to open your work with a weak and confusing sentence. Try rearranging it so that it is something more like, "Slowly, she sees the depression she sinks in is ridiculous, and she begins to radiate." Don't have to be exactly like that, but rearranging it will make your point stronger.
Line 2: Good work.
Line 3: Good the way it is, also could try, "Her enemy Nostalgia...", but it's also fine how it is.
Line 4: VERY awkward sentence. Long, drawn out, hard to understand. Try something like, "Her loneliness haunts her; making her learn about herself every day," OR, "She learns about herself every day through her haunting loneliness".
Line 5: Try instead, "She seeks the company that is never constant; those who only say they are her friends". It make your meaning come out much clearer.
Line 6: Nice.
Lines 7&8: These contradict line 6! Is she feeling better to be alive or contemplating suicide?

"Never has she believed that she could survive on her own. Depending on others and for living for others was how she lived. He broke her heart and he broke that curse. Such depression over one person is ridiculous, is it not? Though, it is unavoidable. She wants to rid herself of her insecurities and become stronger. Inside, she tears herself up and ruins herself. Slowly she tries to fix herself, and she begins to radiate."

Line 9: Nice.
Line 10: "... And living for others..." instead of "and for living for others".
Line 11: This is the first mention of "he" in this poem. It's confusing to suddenly have a reference to another character pop in. Try to introduce him before this so that when you mention him breaking her heart it doesn't come as such a shock.
Line 12: Nice.
Line 13: Good.
Line 14,15: Good.
Line 16: I would add "thus" before "begins", so that it says, "... and thus she begins to radiate".

"She fights off the depression and keeps the thought of dying aside. Awakening starts to feel a bit easier as she continues dragging herself out of the comfort of her bed. Distractions comfort and pour warm into her. In the mirror, she observes how everyone sees her and declares herself beautiful. Self-love comes slowly, bringing out the radiation. The negative sensation shrinks down. She wants to live."

Line 17: Good.
Line 18: OK.
Line 19: "Warmth" would sound better than "warm" in this context.
Line 20: Good.
Line 21: I would say "Self-love returns slowly..." instead of "self-love comes slowly". The way you have it implies she never had any self-love, but above she sounds like she was like a very secure person before she became depressed.
Rest of it is good.

Again, I know this is a lot of review, but I only put this much time into what I consider worth it. I enjoyed this piece and hope to see more of your work.

Rose