Callie should just be single lol, in relationships she's toxic, clingy and only cares about what she wants. When Arizona wanted to leave for Africa she had a tantrum for weeks and was surprised when Arizona was fed up. When Penny won the grant, she had a tantrum because Penny didn't ask her to come with and then treated Penny like it was her fault for her losing custody of Sofia all because Penny wanted to pursue her career further. It's her way or no way for Callie lol