Hello. I've NC for this. I need some advice and can't talk to anyone in RL :(
Basically. DH has an iPhone with a passlock. It's always on him but not obsesively so. My phone, FYI, is always unlocked, often leave it about etc.
Anyway, at the weekend I see his phone on the side unlocked so - I'm embarrassed to admit - I have a little peek.
Basically I find two things, that last week he had dinner with a female colleague -just them. Secondly that a girl he used to work with (who I've met with her boyf) is chatting to him on WhatsApp and sent him a pic of her and her friends (just a normal group shot, nothing rude) along with chat. Just a bit weird.
I asked him who this girl was who he had dinner with and he said she was just a mate and that she was the only colleague who wanted to come out to eat, he didn't find her attractive, and he didnt tell me as he thought I'd be jealous. 
I didn't get enought time with the phone to have a real dig but just the basics. Nothing else to really worry about. The thing is years ago I caught him flirty texting girls about ten years ago. I have a rough suspicion he kissed another girl in a club (from reading an email 10 yrs ago) but I don't know. Away from me he seems to be a bit flirty. A few months ago I saw he was texting another female ex-colleague - all a lot of 'ooh saucy' and winky faces... but didn't see anythign else. I know she mentioned her own DH in the texts.
I've read him the riot act about it - and said to tell me if he is going to do that again and that talking to other girls like that (he used a pet name for her in the text) is disrespectful. He's apologised.
The thing is, our relationship is all good - apart from a lack of anything physical. I keep trying but it's every few months if I'm lucky. So why is he flirting outside our marriage and not making the effort with me?
I don't know what to do. We've been together so many years and I'm at an age now where I want to be having children. But what will he be like then?
If I try to talk to him about relationship issues, he generally turns it back on me - I don't do enough around the house, we never go out together... neither of which is true. He gets on the defensive until its impossible to keep talking.
Any advice? What do I do? Sorry to ramble on.