I want to forgive us. How do I move on?

To make a long story short, my boyfriend was my high school sweetheart. Our relationship had always been healthy up until the beginning of this year when we became toxic people and were emotionally hurting each other. Months went by without much contact but he reached out in April about fixing things and how much we missed each other’s company. He left for basic in June, now he’s coming back and about to enroll back into college where I’m at. I find myself dwelling on moments that happened throughout our “dark” months. I become heartbroken and he has to reassure me all over again. I began therapy, today was my first day & I feel ready to begin the process of healing and moving past that... but how?

Without giving much detail, how do you come to terms with unsettling experiences? How do you move past events that broke you down and left you shattered?

Like, I know he’s changed. He has proved himself to me over and over again. Now, how do I let go of that past image of him when we were BOTH not in a good place?