It sounds like a promise to Eleanor and Danielle in particular, that through the distance and the tough times Liam and Louis will still be coming back to the girls. In addition, it would also be logical to be aimed at their families because they don't see them very much either and fame tends to have a negtive effect on family relations eg. it might take the boys to looney land and they'll be rather up themselves.
It sounds like a promise to Eleanor and Danielle in particular, that through the distance and the tough times Liam and Louis will still be coming back to the girls. In addition, it would also be logical to be aimed at their families because they don't see them very much either and fame tends to have a negtive effect on family relations eg. it might take the boys to looney land and they'll be rather up themselves.