Is this different in meaning from just saying "I miss you?"

Native speaker’s answer
Rebecca
No, they mean the same thing! "I'm missing you" just emphasizes that it's continuous, whereas "I miss you" could be a single thought and not an ongoing process. Ex: I'm missing you so much on this trip! I wish you were here. => Many times I miss you on the trip; used for emphasis. Ex: I miss you! Come and visit. => more general = I'm missing you! Come and visit.