when it isnt enough?

(Note: i am not talking about anything romantic in this post, so dont think i am)
What do you do when the friendship you're being offered isn't enough? What happens when you want more? When despite that you want to grow, you're stuck in one dimension?
Do you continue on, pretending nothing is wrong? Even if it tears you apart? Do you cut it off, give up hope that it will ever get there? Do you tell them, even though they can't change anything (currently)? Or does that just add the burden unnecessarily to someone who doesn't need it?

i know i post a lot of rhetorical questions, but many of these aren't. i'd like actual answers...