I asked my girlfriend, "Do you love me?" She said "no" and I said "Why are you doing this?" She said, "Ha ha ha ha ha"

Generally speaking, when a girl is asked such a question and she just laughs it off, there are two possibilities. First, the other person doesn't love you, but he is afraid of embarrassment and sadness, so he will laugh. The second is that she likes it, but she is embarrassed to express it.