Tell me, I have a good friend who is very good at eating.

It depends on your relationship with him. Do you care more about your relationship with him or money? If you care about money, just tell him directly that you don't want to eat with him, and the problem will be solved immediately. If you care more about your relationship, the issues need to be discussed separately. If you have enough financial resources and can afford to pay for each meal, then it doesn't matter if you suffer a little loss in order to maintain your relationship. Your loss will make your friend more comfortable and can better maintain your relationship. Then your loss is worth it. If you don't have enough financial resources, then you can calmly tell the truth to your friend, or tell a tactful or white lie, and refuse the matter. So, you need to take a look at what is in your mind and then make the appropriate decision.