am I wrong? am I just a butt?

I have been dating this girl on and off for the past 8 months, we go a few weeks everything is good then it just gets to to a unbearable point to where we can't be around each other for a week or two!

Last week her house burnt down, her along with her two kids and her mother has moved in with me, I was trying to be Mr. Nice guy....I work 7 days a week...so I stay tired all the time and never really have any time to do anything fun...oh she has no vehicle so daily i am asked to more or less be their taxi service......am i wrong for getting irritated at this?