Navy relationship, please help

So, I've been dating this guy for a few weeks now and he left for the Navy so I haven't seen him in a little while. He only went to bootcamp and he will graduate in 8 weeks then going to school for 13 weeks. I won't see him until the end of August. We have been writing letters and I received his first letter yesterday. I want to tell him that I love him, which I do but I'm scared that it will throw him off. I've known him for three years and in the past year we've gotten really close. Do you think I would freak him out if I told him I loved him in one of my letters? Also when he returns for two weeks in August I'd like us to be more intimate without having sex. But I'm worried that he won't want to. In his letter that he sent to me, he told me how much he missed me and that he thinks of me all the time especially before bed. What do I do?