Honestly, the best way to think about it is this: don't reveal private / personal information about a person that can be directly or indirectly linked back to that person, unless you have permission from that person to do so.
So stating "I am in a relationship with <insert member name here>" is against the rules unless the member in question has given you permission to reveal your relationship. You could alternatively say "I am in a relationship with a girl named Sarah" and not break the rules, because "Sarah" is a name that could apply to countless people, even if she is a member of the forums.
So stating "I am in a relationship with <insert member name here>" is against the rules unless the member in question has given you permission to reveal your relationship. You could alternatively say "I am in a relationship with a girl named Sarah" and not break the rules, because "Sarah" is a name that could apply to countless people, even if she is a member of the forums.