I have a client like this, except I am very much full time. Keeps texting me with his advice, ideas, silly questions, dinner offers (non paid of course), despite telling him over and over again that I am too busy to go for dinner with him if he is not paying and I'd rather earn some money than waste my time eating pasta.
Unfortunately, this type of clients don't take it well if you try to explain that 'this is just business' and will probably stop seeing you when they realise you are only doing it for the money. They have a deluded idea, that you see them, and give up your real life to spend time together, because they are special and you have a 'connection', and perhaps one day you could go on a weekend away? (free of charge of course)