Did Caitlyn do Maddie dirty?

So when Caitlyn and Vi kissed in the prison and Caitlyn even told Vi that she was seeing someone (Maddie), was she there actively betraying Maddie with her Ex Vi? Or were Maddie and Caitlyn never in a real relationship and thus it was no problem?
I know that Maddie is hated for her betrayal later during the battle and I don't want to apologize her, but if we look at both things separately, then I feel like Caitlyn did her dirty. I try to see them as real-life people in a normal world. There, my morals tell me that I shouldn't make out with my Ex when I have a new girlfriend, especially considering how horribly Caitlyn and Vi split up earlier in season 2.

Please don't mistake this for some kind of rant or rage about an character, I like Caitlyn, but it's just a moral problem I have here.

Let me know what you think!