The letter- which was addressed to his weekly column for an American website- and his inspirational response have since gone viral.
The singer is known for his ‘party philosophy’ and was even hired by the UN to visit the Middle East.
The girl decided that he could also help her writing:
"Dear Andrew:"
"I’m a 15 year old girl in my first serious relationship and I don't really know if I'm doing it right. I try to make my boyfriend happy, but I think I just can't do the girlfriend role right for him. Of course I love him, and he says he loves me too, but a lot of the times I feel bad about myself and uncomfortable because of things he says to me."
"I just have this feeling of not being good enough and it makes me feel self conscious, like I'm not pretty enough. He asked me to dress more like the models in magazines even though I don't look anything like them and never could. I'm not a diva or high maintenance like some other girls at my school, but I sometimes just feel stupid around him."
"I don't want to say anything to him because I really don't want to be a bitch or make him mad. I don't want to lose him. I need him right now really badly, and I love him so much. How can I make this relationship work?"
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Andrew wrote a touching response.
“You're a wonderful, special, and beautiful person who deserves to be treated with respect, kindness, and love. No matter how much you may care about your boyfriend, and no matter how much he says he loves you, you should never be made to feel ugly, or pressured into acting or dressing a certain way or doing anything that makes you feel bad. You should be able to be yourself."
“There is nothing wrong with you that you need to fix in order to be good enough for him. That's the best thing about a true love relationship -- you get to be yourself exactly as you are, in fact, you get to be yourself more than ever, and you get to be loved exactly because that's who you are.”
“If your boyfriend is acting this way, it doesn't mean he's necessarily a bad person, especially if this is his first serious relationship too. He might not really understand how to treat anyone properly, let alone a girlfriend. You both are learning as you go, and if you really do love him and want to stay with him, then you can help each other get better at being together.”
“Even though it can feel very awkward and uncomfortable, a true relationship requires you to be open and able to talk about anything and everything. It especially requires you to be able to tell him when he's hurting you. And if he really does love you, then hurting you would be the last thing he'd ever want to do.”
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“Having high standards for love and affection and kindness is not being "a diva" or "high-maintenance," it's being a human with enough strength and self-respect to stand up for herself and her feelings"
“No one deserves to be in an abusive relationship. And just because you're not being hit and beaten doesn't mean you're not being abused. No amount of love is worth any amount of abuse. You're happiness is worth too much to tolerate someone who only tries to bring you down. It's not your job to stay with someone just to try and make them happy with you.”
“True love does exist and it starts with the love you have for yourself. Love you, and never ever stop.”
What do you think of the girl's letter and Andrew's response? Let us know in the comments below.