In my answer to "Love Lorn",  I cautioned her to take it slowly because she could potentially lose a strong friendship if things don't work out. You might be in the same boat.

If you tell him how you feel about him and you find out that he doesn't have the same feelings for you,

She doesn't have to tell him how she feels, She should just ask him out

would that put a strain on your friendship with him or with the others in your group? As I told Love Lorn, it is sometimes a mistake to force the issue and make things happen "before their time." On the other hand, if you have carefully weighed the potential losses (or complications) and are genuinely OK with the possibility of what you might lose, then maybe you should go for it.

I disagree, if she waits she might lose the opportunity.

Since you didn't indicate whether you think he shares the same feelings, I would spend some more time with him and see if you are getting an indication one way or another. When in doubt, you might be better off trying to honestly assess his intentions

If she waits too long, she might miss the opportunity

. If he is interested in you, the "delay" won't harm that. If he isn't interested in you, the extra time you take may help you figure this out. Once the words are out there, you can't take them back!