What is going on here? please help i'm so confused!?

last night my boyfriend came round, we watched a film and snuggled on the sofa! when the film ended we went to bed, but instead of cuddling he went ice cold on me and didn't want me to touch him! i asked him what was up but he just said nothing! i was in a bit of a bad mood but i tried not to take it out on him! but this morning he was still very negative towards me, i sent him a text saying that one day this weekend i will pamper him an look after him for the day and i got one back saying Thanks but i'm going to do my own thing this weekend, so you can to! i have no idea what suddenly brought this on and now i feel like crap! please help?!?