Ok, without a specific requirement in your neighborhood or contained in your deed that you must have a fence, a fence is an optional improvement to the property. If there is no requirement, neither you not your neighbor would have an obligation to repair or replace the fence. Therefore, if he doesn't agree to share the cost you cannot legally force him to do so. As for his offer to help, that would be considered a gratuitous promise that he would be under no legal obligation to follow up on.
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But if he stated prior to you starting, "Sure I will pay for half of the fence" and you relied on his statement when replacing it, you could possibly have a claim for breach of oral contract and for "detrimental reliance". This is an equitable argument that arises when one person relies on the statements of another and acts based on those statements then suffers a detriment because of it (incurring the entire cost of the fence). It is closely related to "estoppel" which is when A takes a postion that B relies on and then A later changes his mind. B can argue that A is then "estopped" from changing his position since B relied on it when acting.
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But this would require B to file suit against A and prove that A did promise to pay for half the fence, which may be difficult to do since it was just an oral statement which A can claim they never made.
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I know this may not be the news you had hoped for.
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Thanks.

Barrister

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Please keep in mind that I am trying to help you understand and resolve your situation. I don't make the laws, I am just reporting or interpreting them, so the outcome may not be what you had hoped for.

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