I'm sorry you find yourself in that situation. Wish I knew what to say to help.

Trust issues, I think, spring from many sources, even sources in early childhood. Maybe I am wrong about that.

Some people say couples therapy helps but I don't know much about it.

Sometimes time has a healing effect on old wounds and feelings.

So sorry I don't know how to help.

Hopefully others here with more wisdom and experience will see your post and respond with better words than my poor words.

My heart goes out to you!