How do you forgive?

I dated this girl for a year in a half. We are both going to school overseas on a program (separate) for a year. So it was mutually decided that we would take a break for a year and see where were holding off. Meaning like by the end of the year if we both feel like we're the right type of person for each other then we would continue, and if not we won't be sad about it bc it's been a whole year and a lot of time has passed by so we wouldn't be like connected anymore. Anyways so when it came to this past summer, she was sad a lot. Like she was working as a counselor in camp, and she wasn't making any friends at first it was really hard and decided she would call me every day and night for like a emotional help. I helped a lot and did everything I can, and Honeslty I felt like we were back to our old self. Which is good but it's also had bc we didn't want this. So all of a sudden she called me in the middle of the summer and told me that she feels like she 's leading me on, and she said u were a huge part of my life and I won't ever forget you but this is to much. My first thought was maybe she found someone else and she doesn't need me anymore but I didn't think she would toss me away like that and I just said alright talk to u sometime in the future.

Here I'm seeing her for the first time in this new country and I realized she had a thing with this guy in the summer. I couldn't believe it bc we both agreed we didn't wanna date anyone and there she is with this guy. I asked her how far they went, and she didn't wanna answer bc it was even further then what we went. And it bothers me a lot how she can just give herself like that to someone.. And worse she was juggling me and this guy in the same time bc she didn't wanna lose me..

I still feel hurt that she did this.. And yes techniqully we weren't in a relationship but we were still committed to each other.. What's also weird is after I asked her out, bc I wanted to find out how I feel for her and see what it's like to date, I see her wearing his necklace that he gave her.. After she told me she's done with him.. Like I'm just confused, I feel like her heart is somewhere with this guy and it's not letting me move on with her. And Honeslty I can end this all off and not have a problem, she's really hurt me a lot so I can't feel hurt again. And I know that there are a lot of girls out there but this one was my first and I think everyone deserves a second chance. She even admired to me, that I was perfect to her, like I went far and beyond for her and I Honeslty see her as a wife for me. But this whole thing changes everything and I wanna know how do I forgive someone that did this.
Thank you.

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