The legendary actor Sylvester Stallone showed his most romantic facet by dedicating an emotional birthday message to his wife, Jennifer Flavin, who celebrated 58 years on Friday. “For the best wife a man can have. Happy birthday, my love,” he wrote ‘Sly’ on his Instagram account. The 80-year-old artist accompanied his message with a series of photographs along with Flavin, whom he married in 1997 and with whom he has three daughters: Sophia Rose…