Straight girl in love with a gay man

To start off I want to say that I am a straight girl and I have been infatuated with many straight guys in the past but I think this may be the first time that I have fallen in love, and as the title suggests, it is with a gay man. This guys is the kindest person that I have ever met. He is sweet, gentle, selfless, passionate about his work, hardworking, and has an amazing sense of humour but since he is so shy, only people who know him well have had the privilege of knowing this side of him. He had helped me a lot during a time where I was in a dark place so I thought maybe that was why I had gained such a strong fondness for him initially. However, as time went on I realized that this fondness has grown into romantic feelings and nothing could compare to the lightheaded feeling of euphoria whenever I am near him or at the prospect of seeing him or hearing his voice and sometimes my hands would shake whenever I made physical contact with him, even something as small as the accidental brush of our hands. This was 3 years ago. I was so confused since I was still very young. Ever since I went to another city for school, I thought this break from seeing him all the time would eventually dim my feelings but on the contrary my feelings only grew. I can no longer look at other men and develop romantic feelings for them and even though sometimes I find them attractive both physically and personality-wise, I can't even bring my self to have a crush on them because of my love for this gay man. I am depressed because I cannot see him in person often enough and feel his presence. This gay man does not know my feelings and I intend to keep it that way since I know for sure he is gay and I don't want him to feel any kind of discomfort of knowing what a dark path he has caused me to go down. He is so sweet and kind, it would hurt him so bad to know that he has cause so much pain in another person.I really need some advice from gay men as to what I should do and please tell me from your perspective how you would react and feel if a girl had such strong feelings for you even though they are completely aware of your sexual orientation.