Looking for advice.

Hello,So my boyfriend and I are set to being in a relationship on facebook. I'm currently studying to be a teacher, and I don't want my sexuality to effect my employment at all. I know this sounds like I'm sneaking back into my closet, but I want to make our relationship hidden for this reason... on social media anyway. I have no problem with my close friends knowing my sexuality.How do I bring this up with my boyfriend? I'm worried he's going to take it the wrong way and I'm a little nervous.