Long distance? How to handle it?

So my bf has just moved across the country and we are trying the long distance relationship, he promised he will be back when he’s 18 and that he will visit me as much as he can he has been my best friend for years and he is the only guy that has ever treated me right and I actually see this relationship going somewhere, he gives me feelings no one else has given me this relationship feels promised but now that he’s up there he barely text or call me anymore but when he does he’s dry with me the whole time and today is our anniversary I felt like he didn’t even care he didn’t send me a cute text like usual he didn’t post me, he didn’t even really talk to me all day. I do tend to overthink a lot and I have bad depression but what do y’all think is going on out of no where? And what should I do?

Also some other questions for people that have done long distance how did y’all make it work? How do you make the time go by faster? How do you not be depressed? Is it worth it? Is there anything I can do on my part to make it easier or better?

I would love to have any extra information I need to know on long distance relationships please

Thank you ❤️❤️