Have just seen your post from last night 
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You poor soul. There you are being very brave trying to piece together your life after he's swung his sledgehammer at it (and making an admirable job of it, as we can all see) then he prises open the barrier you're erecting to keep him out to wound you yet again.
While you're still licking your wounds it seems that he's off without a care in the world having a fab, exciting, adventurous, globe-trotting new life with OW (don't care what other mners say about it not being the new woman's fault in cases of infidelity, it means 'orrible witch to me). And it hurts all the more because he was not like this with you.
But you know, it will not be what it appears. I've seen this time and time again; people seem to be transformed by a new relationship and start behaving in a way totally out of character. She will have been keen on the idea of a holiday and he will have been carried along with her enthusiasm for it. And it wouldn't do to be upsetting her at this early stage. But don't worry - people always revert to type. It won't be long before he's back to being the boring fart he was with you. And she will be nagging him about it.
The passport issue has really annoyed me. You've given him more than enough time and opportunity to collect his personal effects. I would have suggested sticking it in an envelope with a second class stamp on it - or better still , no stamp at all - and posting it, keeping my fingers crossed it would be lost. However, I seem to remember he wouldn't give you his address so I suppose that's out of the question. But if you give him it back you ought to make it crystal clear that that's the last you want to do with him. He only sets back your recovery when he contacts you.
And don't forget, he may not be going on holiday. People see their passports as important, precious documents so he might just want to have it in his possession.
Hope you're feeling a little better this morning xxx