Forgiving doesn't mean that everything's OK, though. You can forgive someone without ever telling them and without ever speaking to them again. It means to stop holding on to all the hurt. It's like that old saying, "Holding onto anger is like drinking poison and expecting the other person to die." I find it's helpful to think of forgiveness in the sense that a bank forgives a loan. The bank moves on from wanting the debt paid back. It doesn't decide that the loanee is just great at paying and wants to loan them more money again. It just decides to walk away instead of continuing to ask for repayment that's never going to come. It's for your benefit and peace of mind, not for the perp's benefit.
In 2014, my oldest friend, who I'd known since we were three, did something truly awful to me. I tried to get past it, while remaining at a distance. Eventually, I confronted her over email (we lived a long way apart) and her response told me everything I needed to know. She absolutely was not sorry and could not have cared less. At that point I went absolutely apeshit at her. And I haven't spoken to her since. Twelve years on, I have forgiven her in the bank-loan sense. I am grateful for the forty years or so of friendship that we had, especially the thirty best years. I am keeping the silver amethyst necklace that she gave me for my thirtieth, in case I ever feel able to wear it again. I kind of regret losing control. I had already expressed myself very clearly to her and got an answer. I don't even know what she said back, as I blocked her. It didn't do any good except stress me out and make sure there was no way back if she ever DID want to own what she'd done and apologise profusely. Nothing can fix what she did, and I'll never be able to be good friends with her or trust her again, but I feel it's a pity not to be in touch with someone who knew me my whole life, and vice versa.
I don't think forgiveness is a good term. I think it's more accurate to say that I moved on from the hurt. I stopped feeling angry and shocked. It was very helpful, because it automatically meant that I moved on from other uncomfortable emotions around it, too, like remembering how awful it felt to have her turn against me and just after my mother died, too. When you forgive, in the bank-loan sense, you move on from the whole mess.
I hope OP is able to get to that place. I did confront my betrayer, though. And her answer told me a lot. So I got closure.