I didn't contact my H for 8 months, only four emails. One hoping he's was ok,another to thank him for money he sent me for Christmas, one then in February last year still hoping he was ok (he answered that he thought he was) and the last one in May hoping he was having a nice Birthday.
I actually found NC (once I'd made that decision) much easier than my previous emailing every week or so.
As the advice here goes, he can't miss you if you keep contacting him. There is nothing you can do about his R with the OW. The only thing you can do is GAL and wait for it to fizzle out.
My H contacted me after hearing of my breast cancer diagnosis. I doubt he would have for a long time wi thought that.
We are regularly in touch now and he says he plans to leave her as the R didn't develope into anything......for him.
That was five months ago. He's still there. I'm not mentioning it. He will leave when he's ready to.
I would strongly advise NC, it was the best thing for me. Detachment, on the other hand I find very hard.