Ahhh I understand now, you have fallen in love with a gay man and you are a woman...right..well there does pose a small hurdle there. There is many feelings of pain and sadness when you indeed fall in love with someone that you are not able to share this love with. While you may love each other as friends and have a wonderful relationship as friends, the path to being able to be in love and share a romantic relationship is not open.
There are many things that you can do in this space, some are more permanent, like removing yourself from being in this person's life, however if they are a dear friend already I am sure that is not an option. Another option is to perhaps give yourself some temporary space from this person so that you can create space and not feel the need or want to see them all the time. This is easier said than done but is helpful in calming the "need" to see them.
I still don't think that there is anything wrong with letting him know how you feel. His feedback might help clarify things for you and help you with putting the friendship into perspective. Also the other side of the coin is that he might be open to exploring a relationship with you. Is he gay? Is he Bi sexual? A conversation cannot hurt here.
If he indicates he is not interested as he is gay then I think this too will help you to manage your feelings and also the expectations on the friendship, he will have told you very clearly that he is not available. Sure it will hurt and you will feel sad, this is all apart of not having your feelings matched by another and almost feeling rejected, however, time and space and knowing that you can still have a friendship will be helpful.
Distraction and keeping yourself busy is helpful, but acknowledging the thoughts of him as they come to you, let it hurt and know that is ok, then take a moment and move to the next task to get on with your new thought. It is fine to feel sad about this, you will.
How are you feeling today and do you have anything fun planned for the weekend?
Sarah ..not Aaron..lol..I am also a Sarah...