Facebook and Relationships..Should You Add Your Boo to You Friends List??

My co-workers and I were having a discussion about Facebook and being friends with someone you are dating. There was a situation where Keisha (names have been changed to protect identities :) is dating Steve. They have been dating for 11 months. Keisha and Steve have gotten very close and spend alot of time together. Keisha sent Steve a friend request on Facebook. He never accepted. A few weeks later they are hanging out at her house and he is on Facebook on his phone. She takes this opprotunity to ask him if he recieved her friend request. He says yes! So she asked why he didnt accept. He says he sees her all the time so he doesnt need to be her friend on Facebook. Also his info area states he is "in a relationship" which she also questions and he just says he never changed it from his last relationship. He is adament about her not being his friend and this makes her question where she really stands with him. So my question to you....Should you be concerned if the person you have been seeing for almost a year- wont allow you to be their Facebook friend or should Facebook just not even be an issue.........