What do I do? What does he want?

My bf is in the army serving in Kuwait right now..he has been over there since dec. he comes home in three weeks..we skype all the time and three days ago he was telling me loves me..im his everything and he cant wait to come to me..then out of nowhere he sends me a facebook messege saying he is scared and freaking out about coming home to me that he cant handle it...he says he thinks he rushed everything with me and now wants to start over and take things slow and when he comes home see where it goes..but he doesnt want to throw me away? WTF? Idk...if its bc he is over there or what? but what do u think?