The actor noted that deception from a close friend compounded the emotional strain on his character.
"Mack feels deeply betrayed by Ross," Robb reflected.
"They were becoming close friends, so learning that Ross knew about Leyla means he has been lying just as much as Charity."
Robb also warned that the threats issued to Dr Todd during the hospital face-off stem from a protective instinct.
"Mack is certainly capable of following through on his promise to kill Todd," Robb warned.
"He loves Charity and Todd took advantage of her and the situation for her own personal gain."
The future of the couple remains uncertain as legal complications intensify for Mackenzie.
"Their love has historically seen them through every challenge," Robb said when asked about whether the couple are strong enough to overcome this current struggle.
The actor expressed concern over how these events will permanently impact the marriage moving forward.
"Given that Mack has been in a similar position before, and with everything Charity has been through and is going through, I truly hope this isn't the final nail in the coffin for their relationship," Robb stated.
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Meanwhile, an insider from the show shared details about other village residents, focusing on Jimmy King's potential exit involving his ex-wife Sadie.
"Death has stalked the King family for years and Jimmy is the only member of the original clan – aside from Sadie – who is still breathing," the insider teased.
