I think the research indicates that, overall, the % of women who cheat is approximately similar to the % of men who cheat.

I think men and women have strengths and challenges. Perhaps your gf struggles with commitment...I have no idea. But I think it is always helpful to take some time and look at the greys of relationships rather than reducing the dynamic or the person to a black-and-white "good" or "bad" unless abuse and danger are involved.

There seems to be a lot of pressure in society for couples to seek someone "perfect." For example, you'll hear things like: "my loving husband of 45 years just cheated on me so now those 45 years mean nothing and I have to leave him." Infidelity is a big problem, no doubt. And humans are fallible.
Long-term relationships require a lot of trust and work from both sides.
Some people do not work through infidelity issues and some do. I know of at least a few couples who worked through it and found their own middle ground and let it go because that is what they wanted.

I am *not saying that you should do that. Nor am I saying the relationship must end now. Each situation is unique. I don't know either of you. I think time and thought and possibly counsel from an experienced therapist could help you. If you begin looking at the complexities of human relationships now, I believe that will serve you well for the future whether that involves a reunion with your gf or starting a new relationship with someone else. There will always be hurdles and problems to work through in any relationship...whether it's sexual boundaries or something else.