I deleted the part of my Facebook profile that says if you are in a relationship. How do I get it back? IE: Jim Doe is in a relationship. (this no longer appears on my profile).
i think you just deleted the post that displayed your relationship update.
sign in to fb and click here :http://goo.gl/8Giwz
or go to profile>>edit profile>>friends and family>>relationship status
now select the first option which is "select relation"
again go to same page and select "in a relationship"
it's back on your profile.
basically you updated it again by changing to undefined and then changing back to "in a rel".
look at both step 1 and 2below, dont forget to save changes at the end of both the steps.