Me (23F) and my BF (28M) are trying to maintain a healthy relationship. We are talking about our problems in the relationship and problems with one's behaviour to be better for each other. We are trying our best to make sure it's not held back so fights could be avoided in the future (ofc, sometimes there are fights we cannot avoid).

The thing is, I am diagnosed with anxiety. My childhood contained two parents who can't control their anger and I tried my best to avoid conflict at all costs. Every time my BF tries to talk to me about something, even when done calmly, I just shut off and only go through with "fight or flight" mode.
I'm scared to the bone of the worst case scenario. I'm afraid that every conflict and confrontation we have will lead to him deciding I'm not worth it and ending our relationship. Logically I know he won't, and he keeps telling me that over and over. but it's no help at all.

It's important to me that my bf and I will keep talking about our problems so we can solve them. I want to be a sympathetic ear but I just can't handle it.

Are there any ways to manage this fear? Any helpful tools you all use? Thanks in advance.