Letting go of past hurts

Letting go of past hurts: My husband is 25 years old and I am 24yrs old. We have been married going on two years in a few months. We've been together a total of 7yrs. However, we were young when we met. He cheated and I was hurt so much! We spent a year apart he changed and we eventually got married!

However I know he's changed but I keep reliving the past! I'm saved and baptized and I know that all old things should be past away! but i still have my guard up i love my husband with all my heart and things are wonderful NOW! but i can't help but to think about the past and how I would handle it if it ever happened again! So my pray is to restore my mind transform my mind to do what it takes to let go and continue to grow spiritual to have a happy long marriage! I know storms will come and I think I can handle them because I know they come! Divorce isn't an option for us! So I wanna make sure we are strong enough! that I'm strong enough to move forward and be the wonderful christian wife I know I am! minus the negative thoughts!