If you say anything and the other doesn't want to go farther they are likely to handle this by not having anything more to do with you. That is as soon as you say anything there are two responses: they agree and you move forward, or you never see them again!

Unfortunately every advice I (or anyone else that I've seen) can get you is right for some situations/people and wrong for others. Move too slow and they give up on you if interested, move too fast and even if they are interested they get scared off. Good luck figuring this out for your exact relationship. Even if you get it right for some relationship that doesn't mean the same thing will work for the next.