Why does this keep happening to me?

Ok, so when it comes to women, I like a girl with a big chest. Girls with big boobs turn me on, but... I keep falling in love with girls with a smaller chest. I would look at women with big boobs and date them, but it takes me a long time to love them, but when a rare cute girl with a small chest comes along, my heart starts beating for them. But I love them, but they don't turn me on sexually like a girl with big boobs does. But I would want to date/ marry them and spoil her. Does anyone know what's wrong with me?
Why does this keep happening to me?
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