Hmmmm....Guys only please?

my boyfriend just got back from a 3 week vacation. The whole time he was gone he was calling me and texting me telling me how much he missed me and loved me etc...He got back a few days ago and it seems like he is going out of his way to not hang out with me. We were suppose to meet up and go camping but he didn't return any of my calls or texts and today things just keep on coming up and preventing us to hang out. He went to go do some stuff and he told me he would call me when he was done. Its been almost 3hrs and no call. What do you think is going on with him? And I understand giving space because I need space too but he's been gone 3 weeks and I miss him! Please help?