hahaha, I actually think he was trying to "get" one of your kids
if there were any girl ... xD. or maybe I'm just making crazy
assumptions.
okay, regarding the issue ...
no, you shouldnt have to pay for everything.
after all, who is the girl dating? you or your money?
if the girl is sincere and isnt after your money, it shouldnt be a
problem to have her pay for her half.
also, if you pay for everything (if you guys are steading), you may
gain the misconception that the girl you are dating is part of your
property.
even when you start to realize her flaws (if she has any major
flaws), you may feel hesitant to break up with her, because, after
all, didnt you just spend so much money on her?
also, the girl may feel guilty if she ever has the need to break up
with you, because though she may feel that you guys may not work
out, it would be a fact that you just spent so much money on
her.
so therefore, in order to prevent such problems from occuring, I
strongly advise you not to pay for everything.