Basically it means:
Solitude + a great change + a new path/something different
These are strong symbols, I'd suppose your relationship with that friend is over (or at least: it won't ever be the same). This can mean solitude (whether you like it or not, for you and maybe also for your friend), but this loneliness is very fertile. Who are you without this person? Do you even know? Maybe it's time to discover it, and that discovery is done alone.
Maybe you'll change, so much that you'll be a different person, on a path to very new and very different things. That path can be so different, it might conflict with who you are now, and with what you (and your friend possibly) believe now.
My guess: the relationship has run its course. As long as you stay in it, you can't grow.
Doesn't mean the relationship has to end, but it has to, at least, evolve, and you need space from it in order to find your path.