What you describe-intense grief, anger, feeling cheated and an inability to trust or be intimate again-fits a common reaction to sudden relationship rupture and betrayal. After a long relationship, the mind and body can respond with strong protective reactions (avoidance, numbness, rage) that feel like they won't change, but these are natural responses to loss and violation of trust.
Next Steps
It would help to work with a therapist to process the breakup, grief and betrayal; trauma-focused approaches (trauma-informed CBT, EMDR, or grief counselling) can be particularly effective. Start with short weekly counselling sessions to create safety, explore the hurt, and build gradual strategies for reconnecting when you're ready. You may consult with me for ongoing, confidential counselling to help you work through these emotions and rebuild trust in yourself and others.
Health Tips
Be gentle with yourself-don't rush acceptance. Limit contact or checking their profile (boundaries help healing). Use grounding (5-4-3-2-1), short breathing exercises, and a nightly "worry journal" where you write the worst thought and then one small fact that contradicts it. Reclaim the body with gentle movement (walks, yoga) and small social steps (one supportive friend call per week). If you ever feel overwhelmed or have thoughts of harming yourself, seek immediate help or emergency care.