My dad doesn't like my girlfriend for no reason!!?

She's an awesome girl, she's so sweet, and caring and she tries so hard to get him to like her. He's so stubborn. His problem is he has tried to engrain in my head to not find true love or get married and I just don't agree with that. He put her down my telling me she's ugly when all my friends think she's adorable. Then he said she's a snake and doesn't trust her when she has done NOTHING wrong to me or him and he knows nothing of her at all. What's his problem? Someone tell me what I should do?
My dad doesn't like my girlfriend for no reason!!?
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