<human>: Give me the gist of the text in a nutshell

My husband has known his best friend "Charlie" for about 30 years, and I have known both of them for about 10 years.

"Charlie" is not 100% honest with his wife about some things, mainly finances. He often discloses things to my husband, and then asks my husband not to tell me or to tell his own wife. 

I thought my husband was ignoring his requests not to tell me things, but the other day something concerning happened. Charlie stopped by after work, the three of us had dinner, and then Charlie said he was going to leave. My husband offered to walk Charlie to his car, which already seemed kind of weird to me. They were gone for a semi-long time, about 10 or 15 minutes, for a 30 second walk.

When they got back I asked my husband pointe blanke if there was something he and Charlie didn't want to discuss in front of me. He acted surprised and flustered, and insisted that absolutely was not the case, and he just wanted to hang out with Charlie a little bit longer.

Well, I did something bad. I snooped in his email. That day, Charlie had emailed my husband asking to hang out and talk about something.

So I know my husband is hiding something from me, but it also probably doesn't concern me.

Should I just forget this ever happened? It really bothers me that my husband is ok with lying to me, even if it's lying to keep someone else's secret. Do I confront him again? Admit to snooping in his email? Or butt out?
<bot>: My husband is keeping his friend's secrets from me, which includes lying to me, and that makes me really disappointed and uncomfortable.