The two of them seem perfect together, but when Ginny confronts him about this, the conversation turns quickly into a break-up. Marcus, being depressed, doesn’t really fight for Ginny, who wants someone who will fight for her. She’s utterly distraught by their break-up, but in Episode 10, she learns what’s really been going on with Marcus when she talks to Max.
Source: https://www.distractify.com/p/do-ginny-and-marcus-break-up-ginny-georgia