I've known him for 7 months won't add me on fb?

[Ronjuna]

It's no big deal. Some people are touchy about who they add on FB.
Trust me, I have done the same. I think it'll be helpful for you to understand since I've been the one who doesn't add people.
1. He might not be lying when he says he doesnt get on fb. Using the phone, probably? Its easy to send msgs through phone but adding friends is a pain.
2. He's very concerned about who he adds.
3. He's very concerned about what YOU'LL see when he adds you.
4. He doesn't feel the need to add you since you seem to get on well through msging only.

hope I helped