Sorry, but I just don't believe this.
Are you really saying, that if your husband went out tonight with his friends, met a woman at a bar, chatted her up and then shared long intimate kisses with her, that your response would be "no problem"?
REALLY?
Because if you care so little, I'm thinking that your marriage is already on the rocks. I would be devastated if my DH did this. Our kisses are so sensual, and him doing this with some random on a night out would blow our marriage apart.
Him, snogging OW on a night out, when he has been with the Op for 8 weeks, is definitely not a good sign. I honestly don't know what I'd do, on finding this out. If everything else is good, I think I'd count it as a first strike and be on alert.
I hate all this "being official" nonsense. It was never a thing back in the 80's/90's, when people were savvy enough to know, on a subconscious level, that if you've been seeing and sleeping with someone for several weeks, that the shared assumption is, that you're not also shagging other randoms.
And as for the "snooping is far worse", what on earth are you all hiding on your phones? I snooped on my ExH phone, and found that he and my best mate were having sex. It was the only way I could get to the truth. I have zero shame and no regret. I don't know why Op went snooping. It could well be due to the past trauma of her cheating Ex. I totally get that. My ExH cheated on me many times, and it totally messes you up. My DH understood that I had trust issues when we met, and was open about everything. It took me many years to let go of the worry, not second guess things etc. If you haven't been through it, it's probably hard to grasp how insecure it makes you.