#...partially. gdi Tumblr give us more description text

[erinptah]

At least when MCU Marc disappeared on Layla and Duchamp for two months, it was because they were fine and he was having a major PTSD episode with uncontrollable dissociative spells, you know?

(...Which is why we can imagine Layla giving MCU Marc another chance after the incident, but it was Marlene’s cue to realize “616 Marc is never going to get better at this.”)

616 Marc here is mostly referencing the 1980s comics (when Marlene was with Steven, but Marc was around, asking her to help with missions) and the 1990s comics (when Marlene was with Marc, and Steven+Jake were both MIA).