Cousins can fall in love?

Yes, but it must be based on the following points:

Cousins must have no common blood relationship of more than three generations.

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In the case of consanguineous marriage:

There are too many similar genetic factors between the two sides, and the offspring can't mutate from them, and the harmful genes are passed on to the offspring. If this gene is autosomal recessive, its children may get sick because they are homozygotes of the mutation. So inbreeding will increase the risk of some autosomal recessive genetic diseases.

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In order to avoid the tragedy of children and human relations, we must handle it with caution. Remember! Remember! Remember! A genetically deformed child and a family with assets of 10 million cannot be cured. A marriage that violates human relations means that both parents can't live with dignity.