Relationship problems

My boyfriend is 916 miles away and we used to be so loving over text, used to even role play and sext (even pictures) now he texts me only once a day and he claims his working but he only works 6pm-2am but only texts me right before work and he's not sexually interested anymore nor does he plan to come see me or get me a plane ticket there even though he has the money, could he be cheating or does he not want to be in the relationship anymore?