When should I tell him that I am jealous?

Anonymous
My boyfriend has a close female friend that he talks to daily. He probably texts her more often than he texts me. I have raised my concern with them being too close on a few occasions. But he has told me that he does and would not have any feelings for her, and that he only talks to her because she has mild depression. She has previously asked him 'will you leave me one day', and he has promised her that he would not. Even if he had a girlfriend. I find myself getting very upset with their relationship and would often wonder whether he treats her like how he would treat me at times. Why am I feeling this way? Pls help...
When should I tell him that I am jealous?
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