I was in a relationship for almost 2 years then she cheated on me. But it was 2 weeks of lies and dishonesty.!

I am not sure what to do. SHe told me first it was friends, then he came over, then, she went over, then they cuddled, then they kissed, then she gave him a hanjob, then he touched her, then she gave him head. SHe would not tell me this but he did after I threatened him. She denied it even when I asked her. She says she is so much in love with me but did not want me to know because it would hurt me and she was never goign to let it happen again. I am not sure what to do I absoultely love this girl more than anything. I have no trust. She swore many times over everything we had that she never did anything when I was away. I trusted her but the lies continue, I dont know but maybe they even had , I am not enitirely sure . Both tell me they did not but I do not know. It would only make sense that they go this far and not doing ? He ed he said. ANd apparently it was only a 5 min *******, what Do I do. Its so hard, im sick every 10 mins, i cant eat , my life is gone. :( : (