That's very heartwarming. It's also my wish to have such kind of friendship. Though I have found it, now we're busy with our lives. You should cherish every moments you have with them. If you three graduates, each of you will be having a mountain pile of priorities that could hinder your time with each other. But if you three will be having problems in the future, feel free to reach me out. I'll be happy to help in ways that I can.