Unfortunately, Krsna never does marry Radharani. Particularly on the earth planet, Krsna is known to marry the queens of Dwarka. Mostly he married Rukmini, for she was a wealthy princess, not to mention all the connections she had in the material world, linking Krnsa to demigods of all varieties!@%$&$ In fact, Krnsa would never marry Radhika in maya's realm because not only would maya become frusterated by this, but it's not proper for the divine couple to enjoy material comforts together. Krsna was married to Rukmini for twenty or thirty years before he later accepted the hands of 16,000 other princesses simultaneously, when his infatuation with Rukmini was waning, so to speak. Therefore, we can see that he wanted the world to know him as Rukmini-Dwarkadisa primarily.

On the other hand, Krsna enjoys Radharani in the forests of Vrndavana to his hearts content, and he even gives her reign over the forest there. However, they are not married there either. Granted, they do have a flower ceremony with Radharani's friends in private, but I would hardly call that marriage, considering he does the same ceremony with other gopis privately as well. Reguardless of all these things, Krnsa loves Radha the best.

these pastimes exist simultaneously