I split on my partner for a month and now i am absolutely terrified every time my brain thinks something upsetting or negative about them, is it normal to have that fear after splitting on your partner?

A few months ago i split on my partner and it really affected us both, and me splitting isn't new, i have split many times before but it was on friends and family never a partner, especially one i love so much, so it
really mentally messed with me. So it was really scary, and i just need to know if its normal to feel this way and maybe get some tips on how to not feel this way ? I just
want to make sure that im not alone in this feeling or experience idk.

After splitting i feel as if my partner no longer trusts me and is terrified that i will split again, and i feel terrible that i made them feel that way.