When my AH tries to divert me into doing for him what he needs I try to just put myself back on what I was doing before he even contacted me and do that until I get calm.
Try to get back to what you were doing or planning to do for YOU before your BF contacted you. If it was nothing than do nothing or read a book or watch a movie or do your grocery shopping, whatever.
Doing this has brought me so much more clarity and focus and keeps me sane.