Friend Zone! It sucks... but is it meant to be?

Jasmine • You always have a reason to smile!
This is a long story. Im not writing my whole life out with him because i would probably end up writing a tv drama. 
 
 My name is Spring and im so deep in the friend zone that its a new level of friend zone. Mark is my ex and he is the guy who friend zone me. 
BUT BEFORE YOU GUYS TELL ME THAT HES MY EX AND I SHOULD GET OVER HIM. Please let me fully explain the story.
I met Mark my freshman year of high school. During those time i was depressed, has social anxiety and couldn't even get out of the house without being afraid. A couple months of drama and of being friends me and Mark began to date and we fell in love. I loved him and we practically understood one another. It was like finding a perfect fit. (Kind of like those oldy satisfying video you see on youtube) Then he moved away. We made our long distant relationship work for  2 to about 3 years.
Then we broke up and found other people. 
It was during this time where i had gotten over him and he got a girlfriend (whos name also happens to be spring (creepy right?)) they are still together but i broke up with my ex. Mark and i stayed friends. Not at first but later on. This brought made my boyfriend (who i broke up with) uncomfortable. And i started to feel for mark again. 
I LOVE MY EX BOYFRIEND! 
 
Feels good to say it our loud. I can feel that he still feels the same but we just cant be together because we live in different states and go to different colleges. 
My question is????  if this is all fate telling me that he isnt the one. Maybe im just filled with infatuation. Or maybe i really do love him. Its killing me inside because he's my best friend. I obviously cant tell him about this because he probably would tell me to stop talking to him so i can move on. 
You are never really explained what true love is because you just feel it and you know wha it is.