I'm feeling hopeless about life after nearly leaving Buddhism in order to marry

I was born a layman. I tried to have a loving life, but my partner wanted me to convert to her religion (Islam) to marry. I was ready to do so. When she left me, I realised how silly I was. Now I'm completely distracted from life. I don't feel having family and I don't think a girl who knew about my past would accept my love. She would know I was ready to leave Buddhism. She did ask me, "Don't you think this is wrong ?" I want to apologize her and promise "I'll spent my whole life as a Buddhist". How do I get rid of my state of mind?