There is no difference between Dutch or Flemish (Belgium) to say "I miss you". Just "Ik mis je/jou".

Ik mis je

hello how are you ? my name is jamel i hope to will be good friends and learn english together

Owh sorry. Ik dacht je vraag was "How can I say "I miss you" in Dutch?", Dus ik gewoon vertal dat. Yes, there is, but not so much (qua: words). Dutch from Netherlands is Dutch, while from Belgium is Flemish. The differences in pronunciation are obvious to them. Both Dutch and Flemish are part of the Dutch Language Union. This means that both languages are part of the same language group.