He better not go back to him. The only way to end this side story is for him to fo live life happily... without that guy. Send him a message that says stop sending me things. And then he meets someone who he can be happy with! Do
Granny doesn't seem like a nice person... maybe he can "buy" her from the granny? I feel like granny would take money. That way the girl can actually leave with him.
Ahhhh I adore both couples so much!