he don't want t to have sex anymore and he's looking up porn.

My hubby and I are 27 yrs old have been together for 14 yrs ( yes we were 13 yrs old) but we didn't start having sex til we were 16, fast forward to now we have 2 kids ages 10 yrs old and 2 yrs old, but the last 2-3 yrs he never wants to have sex like ever!! It's been almost 2 months and every time I ask him what's wrong he said nothing we don't need to have sex every week do we and I told him "Dude it's been almost 2 months" and he tried to tell me know but I keep track of when we have sex just in case I get pregnant but I feel like something is wrong I was on his phone trying to look something up ( he knew I had his phone) and he Must have forgot to delete the history cuz it said he was looking up "Hot babes" "Naked blondes" and shot like that, I didn't say anything cuz it was late and I didn't want to fight. Ugh I just don't get it!!