I was normal guy.........

I was normal guy.........
my girlfriend and I were in relationship from one year. At the beginning everything was OK but after five months she said to me that she is not satisfy in sex with me at all because my cuck is not enough for her wide pussy although my cuck is 7". after that I know she was in relationship with black man and she stay more than six year with him before I meet her. She told me he has huge cuck more than 14". She had a problem with him because he was very bad with her and always fuck other women but she still love him very much and can not forget his way in fucking. In fact, we had some sex but I felt she was not happy and she always says " I do not feel in your cuck inside my pussy, it is so small, my EX-boyfriend was better than you, you are loser". To be honest, when I hear these words I feel very happy, I become excited, and I love here more.
after that I want to make her happy so I tried to fix the relationship with her EX-boyfriend. I went to him and I gave him money to fack my girlfriend, he came and fucked her many time. but she throw me after that and I am become cuckold without cuckoldress.
Please, help me and give me advice what should I do now?
Thanks,