Searching Relations And Returning Them In A Table

I have a table tblFriends:
UserCodeOwner   FriendCode
5                         54
5                         123
5                         478
5                         490
54                       5
123                     5
478                     5
478                     500
490                     5
490                     500
500                      478
500                    490
500                    600
600                   500


As you can see I store each relation twice, i've done that because now I can create a clustered index on UserCodeOwner for faster searching.
What I want is the following:
I want to count how many steps it takes to get from one user to another via their relations and also via which usercode it goes.
so:
from 5 to 123 is one step.
5-123
from 5 to 500 is 2 steps via either 478 or 490
I want to get a result like this:
5-478-500
and
5-490-500
from 5 to 600 is 3 steps:
5-478-500-600
5-490-500-600

Does anyone have a good start for me on how im able to return such results and how I can search through the table most effecively?