I've been in your shoes recently. Damn it's hard. Every woman becomes a threat.
Can you meet him for lunch?
You are NOT pathetic!!! You're hurt and this whole damn shit is scary and exhausting and sad. Do whatever gives you some peace. And then move on. Do something for yourself today. Every time you start to think of the chickies at his job, change the thought instead, to him seeing them as nothings, and that he loves and wants to come home to you.
Another thing I found that helps... remember that you can't change him, can't make him be a faithful H. Tell yourself you only want him if he only wants you. Give up thinking that by stressing, we somehow have control. If he messes up again, make sure you know what you're going to do. In my case, I've told myself and him that if he so much as flirts with another woman, I'm GONE. Simple as that. And mean it. Just having that plan in my head, allowes me to get on with my day, and not stress over what he's up to.
Does it always work? Nope. But it does help.
I hope you end up relaxing a bit today, and try and look at this new job as a possible new beginning for the two of you 
Them : in the past, where they can stay.
