Hi Struglingthroo,
Welcome
I'm sorry that you are feeling so worn down over years. Congratulations on her getting into DBT. It's a step that many pwbPD never take.
Healing from the wounds takes time. You've experienced years of mistrust, disappointment, anger, unforgiveness, and hurt. It's not something that gets fixed overnight. And it may not be safe to do so.
Regardless of your W's behavior, it's important that you can find a place of peace outside of what she does. As this is a new diagnosis, it's important that you begin to move towards a place of
Radical Acceptance for the relationship to grow. Take time to mourn over what you have lost and what you may never have. All of us had hopes and dreams for our marriage and it is a grieving process to realize that what you had hoped for may not happen.
Begin to forgive her. Forgiveness is a choice we make, not something we feel. When you can forgive you are freeing yourself from allowing the other person to control your emotions. You say "I am no longer going to let my anger and hurt toward you control me." Forgiveness does not mean that things have to be the way they were. We have an article about
Is Resentment Blocking Your Recovery . This lesson is geared towards those who are no longer in a relationship with someone with BPD but the ideas outlined in regards to forgiveness can still be applied to those in a relationship.