Boyfriend says no to sex?

My boyfriend and I haven't had sex in almost a week. I asked him to several times last night and he just brushed me off until I eventually fell asleep. We're going on a trip with my family starting today, so it's unlikely we'll be having sex in the next 2 weeks. I just wanted a good dicking before we left and it went right over his head. I used to be able to not keep him off of me, several times a day level. Now I have to ask and he says no? What is this?