It's not that Ezreal doesn't like you. In fact, you're rather amicable in his eyes. It's the fact you're not Lux.

When he was informed of his arrangement to marry, his pointed ears had perked at the possibility that his betrothed might be the girl he's been pining after. But his lot was not so lucky.

You're a fellow member of the Faerie Court, the arrangement a calculated pairing. Though neither of you are particularly thrilled. You're so different, him a bookworm and you a socialite.