If your partner has blocked and distanced themselves from you and there may be a third party involved, it can be a challenging and painful situation. It is important to approach the issue with patience, understanding, and open communication. Here are a few steps you can take to try to address the situation:

1. Reflect on the relationship: Take some time to reflect on your relationship and honestly assess any potential issues or conflicts that may have led to this situation. Self-reflection can help you gain clarity on what might have contributed to the distance between you and your partner.

2. Communicate your feelings: Once you have gathered your thoughts, calmly address the situation and your concerns with your partner. Choose a time and place where you can both have an open and honest conversation without distractions. Make sure to express your feelings without attacking or blaming them. Encourage them to share their thoughts and feelings as well.

3. Ask for clarification: Inquire about the reason behind the distancing and blocking. See if they are willing to share their perspective and if there is indeed a third party involved. It is important to approach this conversation with empathy and understanding, as they may be dealing with their own emotions or difficulties in the relationship.

4. Seek professional help if necessary: If the situation becomes too difficult to handle on your own or if you feel like you need guidance, consider seeking the help of a couples therapist or relationship coach. A professional can provide guidance, mediation, and support to help you navigate this difficult phase.

5. Evaluate your options: While this may be difficult, it is also important to consider your own emotional well-being. Take the time to think about what you want and need from the relationship. If your partner is unwilling to work on the issues or address the third party involvement, you may need to take steps to prioritize your own happiness and consider moving on.

Remember, every situation is unique, and it is essential to adapt these suggestions to your specific circumstances. Ultimately, the key is to foster open and honest communication, prioritize self-care, and make decisions that align with your own emotional well-being.