He had numerous wives
Having many wives was common in ancient Rome, but like he did with so many other aspects of his life, Mark Antony went beyond. The majority of sources claim he had four marriages, but there could have been a fifth. According to Cicero's account in the Philippics, Antony wed Fadia, a rich freedman's daughter. Since Antony was a member of the Plebeian nobility and would have been viewed as marrying beneath himself as such, there is some uncertainty about this relationship. If he did wed Fadia, it was to assist him pay off his large debt. Cicero claimed that Fadia and all of her children passed away by 44 BC.
His cousin Antonia served as his first legitimate wife. They got married in 55 BC as a result of this career-related decision. He accused her of having an extramarital affair with Dolabella, Cicero's son-in-law, leading to their divorce in 47 BC. They had one daughter together. Because Fulvia became his new wife less than a year after his divorce, Antony clearly liked marriage. She met Antony in Athens, but his ire at her behavior made her grieve, which was a key contributing factor in her passing.
Whether or not he would accept it, Antony's marriage to Octavia, Octavian's sister, as part of their reconciliation, was made possible by Fulvia's passing in 40 BC. They got married the same year Fulvia passed away, and shortly after, Octavia gave birth to their daughter. While her husband battled the Parthians, Octavia functioned as a mediator between her brother and her husband and stayed in Rome to take care of his children. Despite not reuniting, they remained married for a further five years until 32 BC, when Antony and Octavian went to war.
He confessed that Cleopatra was his last wife in 36 BC. Her nationality and the fact that Antony was still legally wed to Octavia prevented Rome from officially recognizing his marriage to the Egyptian queen. He most likely wed Cleopatra so he could share in her enormous fortune. Up until his suicide following loss at the Battle of Actium, they had three children together and were still married.