why does things Happen to good people ?!!!!

I am the nicest person anyone could ever meet I love helping I am a fire fighter and volunteer ems on top of that I work for physically and mentally disabled people. I'm pregnant so the fire fighting has mommy off duty for now. But I have a fiance that has been treating me like complete crap for no reason, I'm trying to buy this house but it requires a contractor and I can't happen to find one I've tried everything ! Then I get a call from my mom saying I ruined xmas since I won't have the house by then they can't come and now xmas has been ruined. Like why ? Why me ? I do nothing but be nice and give my all to people.