If you want to move to Sweden to live with someone you need to make an application for a residence permit at the Swedish Migration Board.
Read about the process here.
Honorary Consulate of Sweden
C/O Taylor Smith & Co Ltd
Aqualia Building, Old Quay D. Road
Port Louis, Mauritius
Tel:+230 2063333
Fax: +230 2402884
Mail: swedishconsulate@taylorsmith.mu
Swedish Honorary Consulate
C/O Len van der Hoeven (English speaking)
Opening hours: By appointment only.
Mobile phone: +265 999 84 45 28
Email: swedishconsulatemw@gmail.com
Sweden has diplomatic relations with almost all states in the world, with embassies and consulates in around half of these. Sweden's foreign representation consists of approximately 100 missions abroad and 350 honorary consulates.