I moved your post from an old one, to your own...
Emotional cheating? Well you could say yes, in respect to talking to another woman contstantly but not acting on it.
Texting at 4am and until 1am? That goes beyond emotional cheating in my books, it's called disrespectful towards you, his wife for one thing.
Porn, pictures, does he have a high sex drive? Or do you both have a low sex life?
You have to ascertain whether this has always been going on, and that's him, or whether the marriage has turned more into friendship and this has just really started...
Can you guide us more there.