Hi! I think that you mean keeping the friendship for ever, don't you? I'm not sure that it's possible, because everyone has a path to walk, after that person learns enough from you, that person will be guided to meet others, so that can absorb new experiences and lessons. Nobody owns nobody! Try to make the most of your friends because one day they will have to meet others!

No one can change or save anyone, unless that person wants to be rescued. By your question I assume you mean from drugs, crime etc.

I have a girlfriend,she is the one and only person I love the most in earth and I'd like just to do any thing to be with her.

not sure what you mean by this question? Is this a salvation question?