Why is my boyfriend so weird?

I have been with my boyfriend for nine months now and I only see him maybe twice a month. he is busy with work and his kids so its hard for us to get together. He will not introduce me to his daughter and I just find this odd. I have asked him many times why he won't let me meet her and he always has an excuse. I don't think he wants me for just sex because we don't have sex every time we see each other. I just don't understand what his deal is or what he wants in our relationship?
Why is my boyfriend so weird?
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