Re: Talk to his family?
I agree that you shouldn't take this strictly on personal terms. Indeed, it's very common for young people to be ashamed of their own families, with no apparent reason. Even when they don't have a dysfunctional family, young people can be very critical of them. They may think their parents are unfashionable, too conservative, uneducated, ugly, unable to speak correctly, nosy, controlling, and so on... It can really take time before a young person can accept their own family as it is. Anyway, if this relationship is going to last, sooner or later you are going to meet them. Be patient. The important thing in my opinion is for you to meet them without preconceived ideas about them. That is, listen to your boy-friend but without telling him dismiss what appears to be overstatement or resentment.
By the way, have you already asked him if he would like to meet your family? What did he say? If he proves to be a decent fellow, show him that you like him for who he is and not for who his family might be and are ready to accept discrepancies. I hope your parents can also be supportive of this precept.