My boyfriend likes another girl?

The other day I over heard my boyfriend and one of his friends talking about this girl. They talk about her all the time. And they were looking at pictures of her on Facebook. Then the next day I asked him if he liked her and he's like Why?! I'm like just wondering. He said who told you?! I'm like NO ONE! He's like yeh sure, I'll bet my friend told you. I'm like noooooo I think you do. And he's said no I don't and started making fun of how she looked. And he hung out with her the other day. But I think it's weird how he freaked out when I asked. Maybe he told his friend he did and was afraid his friend told me? Does this mean he likes her?