Tomato
I don't want to come across as too old, cynical, sceptical and jaded .. but when I read threads like yours ... I can almost predict where they are going to go.
I don't mean that in any kind of clairvoyant sense, or know-it-all didactic confidence, but just 'knowing' in terms of the process, the thought process, the emotional process .. and to be fair to you, you have also anticipated that when you talked early on about the adrenaline / anger / other emotions driving your through the early stages, post-discovery, and wondering and waiting when the 'crash' might happen.
And now you have got 'the flat' And 'the flat' (and no I don't mean a single storey apartment) is probably the worst of all. It's just a void, empty, desolate ..... you can't cry, you can't laugh, you can't do anything, there's no energy, the object of your emotion is on hiatus or absence, and there's just this great big gaping fucking flat hole of nothingness.
On top of that your boiler isn't working, you're freezing, pissed off and 'flat'.
But tomorrow .. you know what? The sun is going to come up (even if it's going to be obscured by clouds) the world's going to turn, kids are going to go to school, people are going to catch trains and buses and drive to work, people are going to eat, all kinds of things in all kinds of places ... and your H is still going to be a cheating lying arsehole.
But unlike many on MN he isn't a cheating lying arsehole who has 'rejected' you. In that respect you are rather in the minority on here and a quick scan around of the thread will illustrate exactly that. He is a cheating lying arsehole who rather wants what he previously had, despite the 'soulmate, let's live together' passion of his extra-marital affair.
But it is you, who is going to determine whether or not he gets what he wants. And that's because you have dealt with this whole shitty business in a way that most of us can only be in awe of.
Rejection my arse!