Over reaction or justified emotions?

For the past like two-three weeks my usually very zealous husband has acted like he could take it or leave it when it comes to sex. He’s been passive aggressively rude, and just over all not the same guy. Every night he spends the whole night looking up things for his truck or watching TV. So tonight he gets his phone and goes into the bathroom (as he does every single night) and so I text him and ask him if we weren’t having sex tonight either. He never responded. I can CLEARLY see he’s active on Facebook but can’t take 15 seconds out of his life to respond to his wife. I’m so pissed and because of past hurt my mind automatically goes to the worst possible thing. I really hope he isn’t cheating on me but every sign and action is saying he is. I’ve looked and I can’t find any proof. I just don’t know what to do but I want my husband back if it’s at all possible.