Lou and Mick moved to a nearby street on the cobbles earlier this year, and were quickly billed as the new neighbours from hell.
Speaking to RadioTimes.com and other media at a recent press event, Hegarty discussed the couple's marriage in detail, acknowledging that Lou's life is built around making excuses for Mick's nasty behaviour.
"It is quite worrying how sometimes in relationships like that, you do get taken over by the level of love for someone rather than what's actually good for yourself.
"But actually, when you're in it, it's a different thing. It's not that easy for people in relationships that are particularly unhealthy and, at times, unsafe."
"I think Mick is all she's ever known, and with that, she's definitely got that 'stand by your man' attitude where she'll turn a blind eye to a lot of things.
"Some of her behaviour really makes me wince sometimes," Hegarty added. "She can be quite hot-headed, irrational, and it's sort of like, 'I'll speak before I think and I'll protect my own,' and [it] gets her in trouble."
An upcoming flashback special will give us an insight into Lou's youth, with her connection to Kit Green (Jacob Roberts) revealed - and that's not all.
"And also the reasons why the characters are the way they are, because I think it's rare that we get to look back and see what makes someone the person they are today, and what they've been through and what's happened in the past.
Asked if this is just the beginning of the devastation that Mick and Lou will bring to the show, Hegarty promised: "I know it's the beginning!
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