Did she cheat

I found out about it back then. She denied it and then finally admired to it but said it was only flirting .
I went on her phone and computer and found lots of evidence emails Secret Messenger apps.
when I confronted her at the time she demanded that delete all evidence.
I was wrong to violate her privacy. She told me she felt bad
Nothing was going on and we should move on. I brought it up a few times
After that and she said the same thing. Our marriage was good
Sex was great. We had kids and moved on. She got a different job
And we moved far away.

I found a old email
And this is what it said

Her:
I kind of felt bad after last night
You know it’s OK to go back to just being office mates,
Him:
Fely bad for yourself or me?
Her:
You and subsequently me
Him:
I'm OK...trust me.... But no pressure and no worries. We can chat later
Her:
Ok
Him:
It's ok....sweetie
Her:
Well, you’re always sort of worried, called me a troublemaker last night………I just was thinking about it and I really wasn’t sure what to make of it. So I thought maybe you got yourself farther than you wanted and would like to dial back ……..
Him
Not at all..it's just that when we "hook" up 90% of the time it's after hours when it's more difficult to acount for my time. 10:30 at night still working on mortgages can look kinda funny.

That's why I said we should schedule some alone time

Trust me, I'm totally OK with us,,and last night

My wife was at the office late that night and she got home at midnight.
I know this because I sent her a email wondering where she was
she replied to me at 11:15 PM and said would leave the office soon.
When I asked my wife she said nothing happened.
At the time I had found many emails over a 18 month period
Lots of sexual talk. A few about getting a hotel but no time or date found

But I don’t think anything materialized from that.

I brought it up recently
She apologize to me and said she was embarrassed
And said let’s not address this anymore it will destroy us .

First question
Did she have sex that night with him?

second question
Should I let it go again
With my blinders on?