A boy freind question?

So about a week ago when I was at work Eddie was hangen with his freind Shirley she is like 50 years old so I didnt think anything would ever happen and he has hung out at her house before and nothing happend...Well That night I picked him up after work and he looked sad so I asked him what was wrong and he told me that a chick down the hall from shirleys aptment came over and was drunk..And she french kissed him. He told me he tried to push her away but she would not get off him. He told me that after the kiss she went home and he locked shirlys door. Of course I was pissed about the hole thing but It was done and it happend there is nothing I can do now. Well since then the story has changed so much the 2nd story he told me is that she kissed him and then him and shirley walked her back down to her apartment and then they came back and locked the door. the 3rd story is that after the kiss he walked her down to her place alone and then came right back. the 4th story is that she walked home by her self. None of this was makeing any sence. Eddie has also told me the only people who knew about this was shirly and his dad. Well yesterday his dad called and was talken to Eddie on the phone but he didnt know I was on the phone also and his dad said did you tell aimee yet? Eddie said yes and his dad said did you tell her about the bj too. Eddie got really quiet. and hung up the phone. Then he denied it for about an hour. After I bugged him about it for so long he told me. She kissed him then he walked her home they went inside and she just pulled his pants down and started giveing him a bj. He said he didnt do anything to her. and he didnt want to be mean so he just let her do this..He says he didnt cheat on me....Now I tell him I dont want him to go to Shirleys place anymore and he says Im takeing his freinds away from him....Can anyone give me some feed back so I dont loose my mind....( thanks )