Am I too ugly for my boyfriend?

My boyfriend and I have known each other for 4 months now, but I'm worried I'm too ugly to be with him. He only rarely calls me pretty, and he showed me pictures of all his ex girlfriends recently and said how hot they were. To me he's the most attractive person I've ever met and I tell him that a lot but it never really seems reciprocated. I'm scared I don't measure up and I'm worried he'll find someone prettier than me. Am I just being irrational?
Am I too ugly for my boyfriend?
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