Not selfish, Tom, but a wee bit selfcentered. (see all the red highlights). This is about Her. From her post and yours, she was the injured party and now it's time for you to pay the price. Your only decision is, is she worth it? Is your relationship worth it.
If so, you're going to have to hang on and tolerate her lack of trust until she can once again feel safe with you. Hopefully, you two will sit down and work this out and move forward. Hopefully, if she takes you back, you will never give her cause for doubt again.