Ex girlfriend had sex with another guy 6 days after we broke up. Should I get back together with her?

We were together for 4 years and we decided to take a break a few weeks ago because everything was getting to be too much for us. We were going to get back together but yesterday I found out that she slept with another guy while we were broken up. Even worse, it was literally just 6 days (!!) after we ended things. I love her but I don't think I can be with someone who could do that. Do you think I should get back together with her or just forget about her and move on?
Don't get back together with her; move on
Get back together with her
Don't know
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Ex girlfriend had sex with another guy 6 days after we broke up. Should I get back together with her?
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