What is the best way to say no?

I had a suitor who actually was a close friend. But, I didn't see this guy to be someone I'll be having serious relationship with. I told him honestly about how I feel for him and said that I like us just to be friends. Our friendship ended that day unfortunately. It was sad that I lost a friend but I want him to be happy with someone else. I didn't regret saying NO to him but I regret losing him as a friend. I can't have both things in life but I just face the consequence of my action.

I think it is best to just be honest and say no.. This might be harsh or seem insensitive.. But I think it is the best way.. Have a nice day..

i also cant say no to any one but you should say no cause things are so sorted once dicission are made

I experience before on the situation. I am the one that other party told me NO directly. It hurt me badly, but is good, at least i know the situation and stop my future actions to continue fallen into her. So be straight forward. Say NO directly.