Is a reconciled relationship (post infidelity) really stronger?

It's been about 2 years since discovery my parents had cheated on each other a long time ago. I was too young to even remember and couldn't even form complete sentences yet.

Obviously there must've been some cracks there but I never noticed them. I never even heard them talk about it. Or if they ever did, it must've been at an age I can't even form memories. They never wanted me to find out about their past issues. I pretty much had a normal childhood and loving parents. Nothing was missing, none that I can think about. They're (both are now 52 year-olds) still married, still together.

I'm not an expert on these matters and I guess it's none of my business but I'm a bit curious. If a relationship had a cheating past, where both parties cheated on each other, can it genuinely become stronger? Assuming both parties do the hard work of rebuilding trust, if successfully, is that relationship more stronger than before? I'm wondering because growing up, I've never seen my parents in a heated argument nor any real drama. They would just talk normally, would be very affectionate towards each other and it was like any normal happy environment. Hard to believe they cheated on each other long, long ago.

Is a reconciled relationship (post infidelity) really stronger?
Post Opinion