HI, Chereen,
So many wise and compassionated answers here. I agree with what Sabby said,
"Funny thing about grieving....it takes as long as it takes. No tried and true specific amount of time really. Everyone is different."

There is also something about the dynamic of being attracted to a gay person which is, though painful, perhaps not as final or wrenching as, say, being rejected for another female. You know this man's sexual preference. This should, in time, hopefully soon, alleviate some of your feelings of sadness, and allow you to move on with your life. You can still think of him as a friend.
Love
Patty