Letting go of resentment and forgiving

I have a deep issue with forgiving someone, yet I still hold some type of resentment. I know thats not true forgiveness or giving both side a chance to continue to grow and start over. I am wondering how I can help making someone feel safe when it comes to apologies and making things right. I hate that I was creating distant as an avoidant and my action alone havent made someone I cared about feel safe. I would bring up the same issue even tho we have moved on from it and I crossed their boundaries. Please help me.. this is the reason why im struggling to connect with others. I can admit that im a very cold and selfish person and I don't want to be that person anymore. I would like to hold space for people.