Girlfriend lied about being in contact with her old friends with benefits, how do I deal with it?

Before me and my girlfriend got together, she told me she had a friends with benefits. I told her that if it was me, I would cut contact, because that is what I feel is right before going into a relationship. She told me that she "did not talk to him anymore" and I took that.

Fast foward 1.5 years, and I found out that she was still snapping with him and even invited him to a party where I was. I didn't find out that it was him until 2 months after that party.

I feel lied to and not sure how to act on that. What are your thoughts?

Girlfriend lied about being in contact with her old friends with benefits, how do I deal with it?
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