Simple/Past tense: That's the reason I come/came here

[Jupiter]

Hi teachers

That's the reason I come here.

That's the reason I came here.

Which one should I use? and in which circumstance?

Thanks in advance

Jupiter

[Alan]

Hi Jupiter,

Let me turn these into questions.

Why do you come here?
I come here (regularly) because I like the food in this restaurant.

Why did you come here?
I came here (on this one occasion) because someone told me the food was very good.

Alan
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English as a Second Language
You can read my ESL story Present Simple