What is your advice for a girl with a broken heart?

So this is a long question and I have true respect for anyone who reads this. And your my god if you can answer it. okay here goes. I’m 15 and have a wonderful family. Im really just your normal teenager. I’m nice, funny and luckily attractive. I was raised right and I’m (unlike many teens at my age) still a virgin and have no intentions on giving it up soon. So here is my problem. Ever since I was little I’ve grown up with my best friend who lives about 30 min. away. See now, her family and my family and her cousins family have all grown up together. One night at her 13th birthday party I finally met her eldest cousin who was 15 at the time (he is 16 now). At first I wasn’t interested, but once we started talking I couldn’t get enough of him. At first it was like a hot and heavy crush like nothing I felt before; then it intensified. It’s been about 3 years since that party and between that time we have dated off and on again. every time we end the relationship it’s about other girls or boys and prob our biggest problem not seeing each other or whatever. Look I know this sounds like a typical teenage crush thing but it isn’t. I don’t know if I really fell in love but I do love him. He understands me so well; like the way we talk, move, kiss. Everytime we see each other I can tell (as well as me) that we both can’t breathe. Eveytime we saw each other that burn like the first date we had was inside me. (embarassing) everytime he leaves me for the simplest things like to go talk to someone im left in a daze and sometimes my legs shake. we would stay up hours on the phone talking: not about how much we loved each other or who is the cutest but about real things like politics what was wrong and right and what we wanted to be when we were older. So now its 12 o’clock and im sitting here because after all this time I still don’t know what to do. im still in love or love him so much it’s just taking all of my energy. When we aren’t talking im mean and irritable to my family and sometime get somewhat depressed. Im not interested in any other guys but him. I wish I could hear his voice all the time. and when he does happen to cast the occasional text message and I see his name pop up on my screen my heart skips a milllion beats. So im writing to anybody who has felt this way and how they moved on. Or for anybody that has good advice for a girl with a reverberated broken heart