My girlfriend confessed that she cheated on me because I was sexting other girls?

Anonymous
Long story short. We live 10 hours away so we only meet like once month. We planned to move in together by end of this year. Last weekend she told me that she slept with this guy who was her side boy (he did not know she has a bf). They were together for 3 months. I am so disappointed and can't stop thinking of how that guy fucked her. I asked why did she do this to me. She said it was because she found out that I was sexting 5 different girls. Should I end this relationship? I still have feeling for her.
My girlfriend confessed that she cheated on me because I was sexting other girls?
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