@loubieloo4 so sorry about your husband 
Oh interesting idea for a thread.
My ex and I would argue on occasion and we're both just loud people generally (both from big families) and also we both tend to want to be "mobile" when agitated. A lot of the time not even serious arguments but more on the lines of "banter" or teasing each other. Marriage was actually pretty good at this point.
This led to a neighbour of ours at one place we lived (he was army) overhearing us on occasion (mainly in summer when windows and balcony doors were open)
She very smugly said to me once (I barely knew the woman!) that it was a shame and we shouldn't raise our voices to each other but do as she and her husband did and calmly and quietly sit and discuss any disagreements taking turns to speak, and her friend (the 2 couples had been friendly since the lads did basic training together) was the same with her husband "on the rare occasions we disagree"
Well, about maybe 6 months after she imparted this sage and unsolicited advice we heard an almighty racket! Doors slamming, plates getting thrown the whole works! Then the screaming started...
Turned out the husband of mrs smug had been having an affair with this close friend and she'd fallen pregnant!
She couldn't have passed the baby off as her husbands as he'd been on deployment for months! She'd issued the husband with an ultimatum "you tell her or I will" and it all kicked off!
I've met other couples that claim to "never argue" (meaning they barely even disagree) too and ime there are several usual explanations for their claim:
They haven't actually been together that long so still in a rose tinted bubble
They argue - but quietly so they don't "count" it as arguing - splitting hairs in my opinion
Ones a sulker so they are falling out they just react differently
One of the parties is overly submissive and always gives in as soon as it's getting to that point, usually as they're scared of arguments sadly most commonly because they were exposed to a lot of arguing/fighting In childhood home or they're currently being emotionally abused and it's safer/easier to submit.
They're lying!
I'm from an abusive childhood myself so actually when I was first with ex I was afraid to argue back, my ex was actually really good with me and encouraged me to say if I disagreed with him reassured me that it wouldn't be disastrous.
His parents have a strong non abusive marriage they've been married over 50 years by now, but they argue sometimes too, I think worst point for them was when his dad retired (he didn't really want to retire circumstances forced) and he was bored and frustrated and drove his mum mad! She eventually made him set up a "man cave" in the shed where he could potter, watch sport etc and he was out from under her feet!
When we did split, I suspected the affair but didn't have proof initially and didn't say to anyone, but my mum noticed that we weren't arguing as often as usual and sensed something was up and later said something to me along the lines of "I knew you were done when you stopped bothering to argue with him. You'd had enough"
One of the strongest couples I know (they've been through a LOT in over 30 years of marriage, family opposition, infertility and pregnancy loss, poorly babies, illness and disability, burglary, shock bereavements...) and they bicker constantly but at heart they're absolutely solid, it's just how they communicate
we always make sure we clear the air before bedtime ugh, this is my fathers favourite claim about his mum and him. What he really means is he won't let my mum sleep until she gives in! He'll literally wake her up if he's unsatisfied how an argument ended! If she's dozed off.
@MitziK sorry you went through that I hope you're safe and happy now?