Well first off, the screen shots you give for your website are NOT working correctly as on the back end the only option you have set is
Single, yet on the front end it shows
Single and
In a relationship
I'm also confused as to what the check box at the top of the screen next to
Relationship Type is meant for as I see you have it turned off?
Anyway, the way you set my system (same configuration as your screen shots) means it was showing the two options of
Single and
In a relationship so I just used a language overide to replace
Single with
--- and that will acheive the result I am after (albeit in a very cludgey way!)
Thanks for you help but I really do hope my suggestions around making the relationship system extendable will be looked into as the current system, to be honest, is very limited and feels like it was "thrown together on a Friday afternoon over a beer!"