Backgrid/MEGA Gisele Bündchen and Joaquim Valente’s relationship started off friendly before turning romantic. Bündchen shared that she first connected with the jiu-jitsu instructor after enrolling her and Tom Brady’s son, Benjamin, in Valente’s martial arts academy in Miami. (Brady and Bündchen also share daughter Vivian.) “It’s actually because of my son that I met Joaquim,”…