I'm in migraine mode so I can't do an intro that would really reflect how important this post I'm linking to is. If you've ever had questions about boundaries, being a good ally or felt dissatisfied with how your own allies interact with you, this might clear up some things for you. It's a really comprehensive discussion of boundaries.
http://juliepagano.com/blog/2014/03/10/ally-smells-boundaries/