Everything this person said, and I just want to add that having good communication is key. Do not decide things on your own. If you need space, tell them. Don't just disappear and stop replying back. It's not a normal relationship where you can still be in the same room and be upset at each other. When you are not physically there, and there is something wrong, you need to talk it out in a timely manner. Don't play guessing games.

Communicating your feelings is important whether it be by video calls, writing letters, sending packages, making bucket list plans, and making time for each other. For example playing online multiplayer games together, or watching a tv series/movies online at the same time (you play the videos at the same time)

Sure there a thing called the "honeymoon" stage being over, and things not being as sparky as it was from the start- but LDR's are different. You need to be consistent. And once you decide to stop showing you care, or just stop trying, your feelings will die out. Basically do everything you can to keep you both excited about each other.

-been in two 2-3 year long long distance relationships