Hello my name is ***** ***** I will help you.
What is it you want to achieve ?
1. It's not illegal to send copy of chats to someone. Everyone knows they are stored. You are not recording a telephone Converstaion which may be a different matter.
2. There is no legal standing. You have no right in law to intercept the letter.
I realise it was a Mistake sending it, there are no legal implications for you sending the letter.
Can I clarify anything for you about this today please?
Unlikely. If your Es had an affair, that's not your fault!
If I could invite you to rate my answer before you go today please, otherwise the site does not credit me for the time spent with you today. Thanks and good luck. Alex