Signs of Cheating?

My Boyfriend has been acting a little off for the past month and I fear he's cheating.. 
He has been working a lot later than normal he usually works from 7-3 but Latey he will work from 7-9 that's 14 hours? He says he just has to get the job done because there is a deadline. Which I understand but I drove past his work and didn't see his truck? 
Also he's not been wanting to do it he only peck kisses me and doesn't want to cuddle he use to be a huge cuddler I'm scared he's cheating!
What are some signs and do you think he's cheating?