Your letter is way too soft given the circumstances

Use the word "infidelity" instead of "realtinship".. you konw its not just an EA now.. time to call a spade a spade

The "please contact me" needs removed too.. This letter is way too gentle in my opinion..

Don't send it yet.. you have to plan how you will DO this no contact thing before you send that...

I will also point out that your H is VERY LIKLEY going to send a copy of the letter to OW.. so bear that in mind when you write...

He's been lying to you for how many months now? Lying to his own parents for how many months now? Using people to sneak out of the home to have sex with another woman?

You do'nt want to sound desperate or patient... you want to sound like you are SERIOUS and that the DAMAGE is very REAL... the letter is way too gentle i think