I cheated on mygirlfriend I’ve told her she wants to stay together but I feel guilty should I end it?

These are a lot of hard feelings to sort through, simply because of how you feel versus how she feels. The most difficult part is you feel guilty for the action committed and yet she wants to stay together. It sounds like the two of you do need to have a talk about what you both want, is she willing to forgive and work on the relationship? Or is she just unsure of where things stand? There's a handful of stuff here that sounds like it needs to be discussed further to really dig into what course of action that only the two of you can decide to take.