New at the whole LDR thing... any advice?😬

My boyfriend and i have been dating for 2.5 years and this August he'll be moving away to college. Ill still be a senior in highschool stuck in my stupid little hometown and he'll be about 4 hours away. We want so bad to make things work dong distance wise and i really love him so i would do anything to keep us together. He says he'll come visit monthly but i know once college starts he'll find out that that might be easier said than done. There's also been a lot of anxiety and tension building up these remaining days before he leaves... i constantly want to spend every moment i can with him and we are both a little freaked out with the uncertainty of all that we're about to get into. about a week ago he got super freaked out and called for a break (he cooled down and changed his mind the next day) but i don't want us to still have all this tension that we do now and him to freak out again like that when he's 4 hours away. I'm not sure what i should expect or be prepared for because i've never done this. i know it will be hard but any advice to make it a little easier????