I have set my relationship status on my Facebook profile to "Only Me", can someone still see the relationship status on my S.O.'s profile?

I do not know if my family can see it on my boyfriend’s profile if they were to look him up. They are not friends with him on there, and I believe he only has his pictures and the basic “about me” section public. Would it show up as “In a relationship”, but not with who? What would friends see?