Hi , first of all u told that u both are good frds then there will no such a big problem for u with his gf. Ya it would be difficult feeling alone without frd but being jealous is not good for u. Try to talk with him as usually u do. If u think that he is ignoring u then its good for u to make ur mind with ur family. Because he may also have many things to talk with gf know that he can’t tell u now. Be the as same as u are now because change of any other person will not effect u in ur family life.