Did I do the right thing with my relationship I had?

Sorry if I type like a life story, but I'll try ti keep it short and to the point.

I am an INFJ. 6 months ago I met a girl ESTP through a mutual friend. We started to talk to each other and quickly she admitted that she was interested in me and said that she never wanted to date anyone until she met me. I never really experienced this situation before because I have always been very picky to who I am attracted to and that is why I've never had a girlfriend. But she made me feel different and I did actually feel like I was attracted to her. We had the same interests in music, hobbies, etc. Whatever you get it, I got this deep crush on her. I thought everything was going well and then out of the blue she says she couldn't do this "relationship" thing because it is against her beliefs and that she doesn't want me to have to deal with her problems. She's christian, I'm atheist. So she told me to give her time, but don't wait on her, and that is the mistake I made. I waited and became more attached to her. We leave away from school for the summer and we talk like everyday. Then halfway through the summer she starts to talk to me less and less. By the end of the summer she tells me she doesn't have feelings anymore. It hurts me because I believe that she was the first person that made me feel that way and accepted me for who I am. I believe she was the first person I fell in love with. We talked less and less by the end of the summer and eventually we get back to school. She texts me and tells me she wants to hangout. I hangout with her and the whole time I feel terrible because I still have feelings for her and I know that she doesn't and has moved on. So I tell her my situation and say that I can't really hangout anymore because I'm trying to let go of her because I still have feelings, and she didn't understand how someone could be so emotionally attached like me. So now we aren't friends and I feel terrible with that I did. I just figured that not being around her and removing her from my life would be the only way for me to move on and diminish my feelings for her. I see her from time to time and I just feel my heart drop. The other day she bought something from a bake sale that my organization was running and just saw the expression on her face. She wouldn't look up to me and her face just showed pure sadness. I felt so bad. I miss her and I think about her and what I did like everyday. Is there a way I can make it up to her? I still have feelings and I don't believe they are going away anytime soon. Is this a common trait for INFJs to be so attached and not letting go?

I just want to know, based off of everyone's opinion here, if completely removing her from my life to get rid of my love for her was the right thing. I figured it was the only way for me to stop being so attached to her. Anyone have any advice/opinions?