Search Results: forgiving girlfriend

A few years ago, my ex came back into my life after breaking up with me because of her religion. We didn't speak for two years, and that night we were on the phone almost 6 hours.
After a few weeks of talking, I told her I still had feelings for her, and I couldn't just be friends. She didn't understand, and it was at that point I told her I had been in love with her. Then it clicked for her.
Over the next year, we dated, she fell in love with me and she made an attempt to make the relationship work. I even proposed to her. Then she decided to go on a mission.
She broke up with me after a few months, then spent two months trying to convert me. She stopped responding to me, and when she came back, I tried talking to her. She accused me of doing things and treating her in ways I didn't do. She blamed the whole relationship failing on me. She saw nothing wrong with what she did, and just talked down to me.
I couldn't understand why she'd treat me so horrible if she loved me. But she got married less than 6 months after returning.
Since then, I turned myself around. I have a new girlfriend, I've gotten into good shape, and grew out a beard and keep up with myself. I've seen her in passing, and she always gives me an unusual look.
My friends say she give me 'I miss you eyes' but I don't see that, but I'm not too concerned either.
At the same time, I hold great pain, anger and resentment towards her for what she did and I haven't been able to let it go even a year later. I feel she shouldn't be forgiven for how she treated me, but I'm so angry whenever I'm around her because of the pain she brought me.
In this circumstance, is it wrong to not forgive someone?

To briefly summarize, I met this girl at work 6 years ago, and we dated for about 7 months before she broke us up for two years because she was mormon and I wasn't. We got back together and we dated for almost two years, with the understanding I'd try her church, and if I didn't like it she wouldn't pressure me and it wouldn't change.
But everything changed because she went on a mission, she broke us up, and spent half the mission trying to convert me, and then stopped talking to me.
She blew me off when she came home and lied to me and accused me of things I didn't do in the relationship.

It's been a year, I have a girlfriend, and my ex is now married. But we had jury duty together this week, and it was strange. Once it concluded, she came up to me and asked how I was doing. I responded, but I didn't ask how she was doing. She asked if I was gonna ask her and I told her I didn't care. She got upset and said if I had loved her I would care about her happiness now.
I told her I stopped caring, I thought the world of her and she betrayed me and spat in my face. I had once loved her, but I didn't feel for her, and her words were hallow because her actions left me feeling her 'love' was just words and part of her manipulation of me.
She said she did, that she cared about my happiness and that she's looked at my social media to see how I'm doing. I told her I was happy to know so I could block her. I told her I'd never forgive her for what she did, but I moved on and don't care about her. As I walked away, she started to cry but I didn't stop and kept walking.

Was I too harsh?