Horrific breakup. Someone please help. 😞 please

I'm only 16 here, but I dated a guy for almost 3 years. First boyfriend and love but he's been cheating and lying. Saying he wants to fix us etc but people keep telling me different stories. We got back together now, but broke up a few weeks ago and it was the HARDEST time of my life. I would cry all the time, I'd have to take happy pills to make it through the day. I was alone as he is my best friend and only friend honestly me and him were so so close and had so many plans for the future. He was my first everything including virginity. Now everything's falling apart and I don't know how to deal with this breakup and move on. Anyone please share a story or give advice on how toy moved on from your first love. This guy is my everything and I am crushed from the inside out. I just love him to death and feel like nobody else will ever compare. Someone please tell me how to turn these feelings off. Will I ever love again? Will I ever be as happy as I was with him? Someone help me.Â