Desert Island: from Tremblay

The guy I met online told me he had dreamed that he was all alone with me on a deserted island and that we were happy to be together as a couple on that island. What does this mean? Please, thank you.

Hello Tremblay,
An island: a refuge (after a shipwreck), solitude (especially if it is deserted) or a paradise on earth (that of childhood, among others); in other traditions or mythologies, the blessed and the immortals live on islands.
The island is the supreme place of eternal happiness.
Happy: to experience an event, pleased with this situation, well-being, satisfaction
Ensemble: a group, an association, a union between two people
Summary:
After certainly having lived through some not-so-easy situations, your friend has taken refuge, after several shipwrecks, in his earthly paradise: solitude.
Meeting you online, he is happy to be in this union with you and would like to share his happiness with you.
Kind regards
Ladysally