Unwravelling the 13th commandment

One thing I am trying to get at is that I think this is the instruction that Jesus was giving: B choose to love C, from one loving moment to the next. AND ALSO C, choose to love B, from one loving moment to the next.

What do you think? Isn't that a little different from the first two Instructions?
(a) The greatest commandment says love God.
(b) The second one, which is like it, says love your neighbour.
(c) The thirteenth says you love him/her and him/her love you.