>>2 optimism is not a bad thing I guess :D
You won't lose them from one day to another, even if they try to keep their distance, I am sure you will still interact from time to time. So just wait and see, talk to them about your feelings, otherwise, they won't notice.
You might indeed be growing apart, but that's something everyone experiences during their lifetime over and over yourself included. I am not telling you to give up on them, but you already went through it once and found new friends, so no matter how it turns out, you'll be fine!