Leaving for the Navy

So my boyfriend decided to sign up to be in the navy and hes leaving in March [3 days before my b-day😓] I am very proud of him for making a big decision like that but I want to know how I should spend the time I have with him whenever I try making plans he decides he dosnt want to go through with them I know after he leaves I wont see him until he graduates bootcamp, and then he immediately leaves for school I wont see him for a year basically. I want us to have some private time together without other people getting in the way. Any ideas come to mind?