You're a Vegan, aren't you? I thought you were-not sure--if you are doesn't he know it? He should respect that about you.
He should also respect that you do not want to talk about what is upsetting you right now.
This is paramount in any truly good relationship with another person in life.

I HAVE BOUNDARIES__I know you care and mean well--but DO NOT CROSS MY BOUNDARIES---HAVE RESPECT FOR ME, my feelings, and my wishes. I appreciate
your kindness in worrying about me--but you are not RESPECTING MY WISHES..
Please, for the sake of our friendship, respect both me and my wishes!!! (((EVENING)))--Theo

I know i't's hard to do in the beginning-it was very hard for me, but it is necessary--one must assert one's rights in a relationship-boundaries are very important.