Hi there mads8796,
Welcome to the forum. Anxiety can get in the way of so many great things. I am sorry to hear you are struggling. One of the biggest steps is recognising that there is an issue in the first place and you definitely have taken this step which is really important. I wonder if you have ever had a health professional work with you to understand and help manage your anxiety better?
There are a lot of really great ways to help with anxiety and worry like Cognitive Behaviour Therapy and Mindfulness. Being able to identify triggers to your anxiety can also be really helpful and creating a journal about when you have felt the most calm and when you feel the most anxious can be sometimes help identify patterns.
There is a great program called Mindspot that is an online course with some telephone based support that goes over 8-weeks that can help you to understand your anxiety better and learn strategies and skills to overcome your worry. You can read about it here https://mindspot.org.au/wellbeing-course
I personally have had similar experiences with worry in relationships and learning how to trust again. It took time and persistence to learn how to stay in the 'now' rather than worry about the unknown 'what if's' of the future or churn over things said in the past. Mindfulness can help take you to the now, and help you get your mind into the present which is a place that is a bit more simple. The drama that we make up in our minds about what could happen is pretty exciting and scary, and it is what our mind tends to wander to.
There is a really good app called Smiling Mind that can people learn some mindfulness techniques. By practicing, you can re-center when your thoughts start to race towards a worrying future and focus on what is right in front of you. There is also a podcast called 'Mindfully' on the abc and there is a segment about Mindfulness and Relationships over a few episodes that can be found here for your interest
Learning about each other in relationship is a journey that has ups and downs. Learning about how to ease worry is also a journey, and it too will have ups and downs. The forum is a great place to learn about other peoples stories and also talk about your own. You are not alone.
Sending you strength,