Aw! I'm so sorry. This is truly heartbreaking to have someone treat you this way. I had this Exact thing happen to me. It was stunning, torturous and I was a wreck.

I wrote. Volumes. And more volumes of all the pain and analyzing I could do. It did help and I did come to realize that it really wasn't me at all. And it really isn't you at all.
But you do need to allow yourself time to grieve this loss. It is like a death and treating that way will make some sense when you start to go through the steps.
Look up the 7 step of grieving, which include shock, anger, etc. You will find that you will visit some of them for longer than others, you may go back to some for a while, but you will learn to let this go. You will be stronger for it.

It sounds like your friend was more self absorbed than you realized at the time.
Please don't let their lack of feeling inform anything you know about yourself. You are clearly a person who feels deeply and that is a great gift.

You will be able to share it again with someone who deserves it. I believe this with all my heart.
Many Hugs to you.