You are one lucky girl. You have managed to capture the attention of my best friend, the man who has turned into my big brother. If you have been able to capture his attention than he must think very highly of you. My best friend deserves the world and I hope that you can give that to him.
I am sure you already know how incredible he is. If you didn't think so then you wouldn't be with him. Over time, you will learn the quirks about him that make him who he is. I hope that you love and appreciate every single one of those quirks. The way he laughs at his own jokes and the way he holds himself to a higher standard are all little things that make him so great.
There will never be a day when you will have to question his feelings for you. He is not the type of man who broadcasts his feelings, but he will make you feel like you are the only girl in the world. He may have a friendly personality, but trust me when I tell you that he only has eyes for you. His heart is wonderful and full of so much love for you already. Please give him your heart just as he is giving you his. Remember to treat him how you want to be treated. I know that he will treat you like a gentleman should treat a lady because he was raised that way and would never dream of treating you any other way. Make sure you treat him with just as much care.
Please don't hurt him. Please don't use him. Please don't play games with his heart or with his mind. Please take care of him. As the sister in the friendship, I naturally am overprotective when it comes to who he dates next, or shows interest in. I will automatically judge you because I want my best friend to be with the best. But, if he sees something amazing in you that I may not, I will support him no matter what. If you make him happy, which I desperately hope that you will, than I will be happy too.
Remember that you are incredibly lucky to be with him. He is unlike anyone else I have ever met. He will treat you with the respect you deserve and will continue to make you happy even on the days when he can't find it in his heart to make himself happy. Don't take that for granted. He will look at you as if you light up his entire world and he will be a push over because he will want to make you the happiest woman in the world. Please make him the happiest man in the world too.
If you are the one that he wants to share his time with than just know that you are already special. There is something amazing about you, something that no other girl has. Don't ask for reassurance and never worry if you two will last, be confident in the fact that he chose you. Him choosing you is the best thing that could ever happen to you.
To whomever my best friend loves next, please take of him and love him unconditionally.