On the flip side, I'm still dealing with a lot of the anger and betrayal, and his infidelity does come up in some of our fights.
After 7 months? Seems pretty clear you've never forgiven him. Read the chapter in DR about infidelity, it goes into forgiveness. The first thing you need to understand is you need to forgive him for YOU. You will never be able to trust him or anyone else in an R if you can't find your way to forgiveness.
I was going to say the same thing. If you simply brushed it under the rug and tried to move on, it's going to rear it's head again and again. And if it's your ammunition every time you're in an argument, clearly, you haven't forgiven him. It's really important for you to do this....not for him, but for yourself. True forgiveness is freeing....for the one forgiving.
