I am sorry to hear you are going through this. I am a lot older than you and I still battle with the urge to to reach out to my exes when I need support but it takes a long time to get to that place where interactions aren't charged and confusing if you ever can.

One thing I wish I had known when I was younger was how many resources there are in my community for people up to age 24. Have you explored that at all? I would do this for you but I am on an iPad which makes it difficult, but try googling for a national youth hotline. They will listen and might know of some resources for you. I take breakups really hard and know how they make you completely unable to deal with more disruptions in life. Your ex very well could come around with space and time and be able to be your friend. Try distracting yourself from thinking about his rejection too much. I know it's really hard.

S.