Boyfriend troubles

Am I stupid for feeling like this? Me and my boyfriend have been together for 2 and half years we have two beautiful children. When we first got together everything was great I felt loved felt like he was interested in me but recently I've been feeling empty :( we never cuddle and hardly kiss our sex life was amazing but now he only wants to have sex when he feels like it I've tried to spice things up but he's not interested. He sleeps on the sofa every night he says it's not to do with me just the fact he falls asleep and doesn't come to bed :( I feel empty and when I try to talk to him he doesn't think things have changed but they have 😢