I’m cheating on my girlfriend. How do I tell her?

Found out about 2 months ago my partner has been cheating on me for basically the entire year we’ve been together. I got mad when I found out and decided to sleep with someone else before telling her I knew. I slept with 3 people in the last two months and haven’t enjoyed any of it.
Now I’m not sure what to do. I’m still in love with her and I have no idea how to even start the conversation.
I’m cheating on my girlfriend. How do I tell her?
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