He cheated?

I cant go into much detail as It happened very recently. But he went out thursday night with a friend. A finally said yes please go have fun bowling etc. well friday morning he told me that he cheated. They started the act but then he told her no he couldnt and got up and left. He never completed the act. He said it wasnt but a couple minutes and he just couldnt go through with it. And his friend told me the same and I believe he friend because he was really mad about it and them two fought over it. His friend was there and said he wasnt in thee for more then a few minutes. But there was penetration. He says thats all there was. He never kissed her etc.

I'm hurt beyond words and you know not a the act of what he done. But that he could do it. I believed all the time he said he would not ever do that to. Im hurt because he could do it. though he did not complete it. It isnt the act its that he went through it. he is so being the best guy i ever had as in how to act after cheating on me. all my exs cheated on me and never treated me good afterwords. he has burnt all cloths and sits and talks to me. he wont leave my side. he is holding me and loving me. i do give him kudos for not finsihing. i know he is truly sorry, I m just so hurt. he is forgiven. but i want to get over the hurt. he is everything i have always wanted and needed as i said in earlier post. just want to stop hurting.