Fence Repair - Split it 50/50 with neighbor?

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Just recently bought our first duplex in Oklahoma, living in one side and renting out the other.

The wind blew down / damaged part of the backyard fence today (the side fence which divides our yard from the neighbor's yard) and the rain eroded out a bunch of the ground under the fence line.

Who is responsible for the repairs? Do we split it 50/50 with the owners of the neighboring house?

Thanks in advance for the help!