Just caught "d"h out in a lie. He has history for telling unnecessary lies, and it's something we'd been working through.
He told some pretty bad lies just after we got married, all related to meeting female friends/co-workers, he lied and said he was meeting male friends. No evidence that he cheated but it's horrible enough to be lied to really. He tried to excuse himself by saying I would have worried which I don't think is good enough. I'd never been paranoid/arsey about things like that.
He has been truthful as far as I can tell for a couple of years, but today I noticed on fb (bloody hate that thing!) that he had lots of new female friends. Didn't see in detail. One of the things he'd promised to stop was adding every woman that he walks past to fb. So I jokingly asked if he's being popular with the ladies again, expecting him to say of course not. He said he'd only added people he works with now ("now" being pretty important, he told me as they met at work almost every day and they were friends with his work friends on fb, it would be rude not to. He said everyone at work is a team and he likes to be part of that team by being friends on fb too. This info will be important later!) , some who were on his team and some who worked opposite shifts but who he occasionally met and handovers.
After he went out I had a look (not on his fb page, but just the recent activity bit that anyone can see) and he'd added 10 people, 8 of them women. Ah well, a small lie, I thought. Looking closer I noticed none of them were people he worked with, so that was a lie. 
All, as far as I can see, are friends of a girl he used to work with or random unconnected girls. They are all young (uni/graduate age) and live at the other end of the country. He's in his 30s.
I sent him a text saying the above in a calm, level headed way. He won't have seen it yet, and I have no idea what to do next. I know he hasn't met any of them (unless he's been telling enormous lies and travelling a lot) but I don't know why he had to lie and why he wants to be friends with young girls who are just friends of a girl he used to work with. It just seems pointless and a bit sleazy.
I know he has the freedom to be friends with anyone he likes, but why suddenly these girls, who he won't have talked to for over 2 years and didn't really know? I'm probably being too "strict" but my heart is a mess after his lies before, and now I know, although it was a relatively small lie, that he doesn't care about my feelings (as he'd agreed to stop, knowing how much his lies had hurt me) and that he could still lie to my face knowing how that has wrecked our relationship in the past.
I know this sounds really petty and I'll probably get flamed for not "letting" him have friends. I've never banned him from that, it was his solution. I want him to have friends, but I also need to trust him. But, he's lied again..