Why does he ogle women online but tells me he's just not in the mood to have anymore?

I'm totally confused!! Since my boyfriend (5 years) and I moved in together has gone from like a 7 to -4. He says it's because he's just not in the mood anymore, he's not thinking about it as much anymore and he's just like blah about now. Great boost for my self esteem there buddy! Anyway with all this taken into consideration you'd think any ual stimulation would be null and void, right? WRONG, he ogles women online ALL THE TIME. Videos of chicks shaking their es, posing in thongs and high heels, squeezing there for the camera and whatnot....WTH is that about? You can't tell me you're totally uninterested in but drool over pictures of chicks on the internet...what's wrong with this picture...Gentlemen please help