Is this too much?

My coworker has been buying me lunch almost every single day for almost two years. I've told him to stop because I don't want him to think I owe him. He thinks I don't owe him anything and he's just doing it for two reasons. He likes me as a person and sees it as looking out for a great friend. The other reason he sees it as nothing but money that he can easily make again. I tried to explain to him that its getting to be a little too much but he dont see it as that.

Is this too much?
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