I posted quite recently about DH's mood, anger etc. He eventually sat down to talk and we seemed to be working through our communication issues ok.
Months ago, I started a thread about this contact with his children etc
www.mumsnet.com/Talk/relationships/2302430-Just-letting-off-steam-same-old-same-old?pg=4
Well, this weekend was another fiasco. Once again he didn't actually tell me that he was going up to see them until I asked, and by the looks of it he's back to the constant contact with his ex-wife. From what he's been telling me, he's been staying at his friend's house when he goes up. Today, I found out that he had booked a hotel room for tonight at the last minute, just for himself. When he called tonight, I gave him a couple of opportunities to give me what I was praying for: to tell me that the friend couldn't put him up for whatever reason and he had to make alternative arrangements as he was there. However, he didn't. So I told asked him directly where he was, and when the answer was a lie I simply told him that I can't do this anymore. I said that this wasn't what I had committed myself to (i.e. someone who isn't trustworthy) and that I couldn't possibly contemplate living like this for the rest of my life. Caught off guard, he didn't know what to say, conveniently 'lost connection' and sent me some pathetic message about me 'dragging us down this route again... we will talk tomorrow and you can explain...". Conveniently, the email confirming his hotel reservation has disappeared from his inbox and deleted folders - yep, I did snoop. It does NOT make it right and it's a violation of one's privacy, but there is no other way of confronting a liar.
He has always been very public about our relationship but when it comes to how he goes about his contact arrangements and his relationship with his ex-wife, there has always been an issue.