Can anyone shed some light on how their spouse got over hurt feelings left over from the unsuccessful parts of their marriage?

My wife often speaks of how she "can't get past" the hurt she suffered, which makes coming back to the marriage fearsome.

Her hurt centers on feeling to be in my shadow and not having her voice heard, as well as not receiving a loving welcome from my parents.

I've been trying to show her how these things will not be a problem (by my actions), and she says she "believes me," but what she calls "the deep hurt" won't permit her to recommit.

Any helpful advice? Books? Types of therapy?