I was looking for freelance work and met with a lawyer who had some work for me. The lawyer asked if I could build a product for him. I told the lawyer I can build the product and will charge him a fee for it. I also informed the lawyer that I would be interested in selling the product to other lawyers. We agreed on this. This was a verbal agreement; no paperwork was signed.
Now I have completed the product and the lawyer wants to go in 50/50 with me on selling it to other lawyers. I told him I am not interested in a partnership with him. Now he wants to take legal action and sue me for stealing his idea. Again, no paperwork was signed and no agreement was ever in place about a partnership. There was no NDA, no exclusive rights contract. In fact there is no written agreement for me to build the product for him.
Now I am getting threatening emails that he is going to sue me and that I should hand over any profits from the product as well as take down the product website.
Does he have any valid reason to take me to court with no written agreement? Should I be worried? He has been sending emails stating verbal agreements that are wrong and never agreed upon.