Episode: blood moon ball

EVERYONE THANK THAT GUY WHO PLAYS THE ORGAN. IF IT WASN'T FOR HIM, STAR AND MARCO WOULDN'T HAVE DANCED AND GET THEIR SOULS BOUND TOGETHER! #thankyouorganguy

Think About It: The red guy said that the blood moon light selects two souls, binding them together for all eternity.

My Conclusion: They are soulmates.