FWB problems

Me & my friends with benefits used to have sex all the time and whenever we texted it would be sending nudes or Sexting. Now we haven’t had sex in 3 months, and when ever we talk it’s just small talk BUT he’s always the one that texts first. We talk almost everyday but it’s never sexual anymore & I know for a fact he doesn’t have a gf. What’s his problem??? And how do I get things to go back to the way they used to be