Will my other Facebook friends see my relationship status even though it's set to custom mode?

[abraXus]

it depends on how you did it

if you are merely trying to mark the beginning and end of a past relationship like that, you should be adding what is called a "life event" instead of using the relationship function, as that is for current things

to create a life event, open your timeline, and look for the "life event" link above where you type your status updates

click that and the rest should be obvious