Work troubles.

I just don't know what do at work. I love working I get on well with my bosses and my friends that work there. Lately I am just feeling used. I got my friends job back (after he was fired twice) and now that his job back I have been pushed to the back. I was the one that was meant to be working full time now I am back to working Friday -Sundays.
I was promised a pay rise which hasn't happened. I give all my heart and soul to that place and I feel like I am just getting used. I cracked it the other day that I just left because I couldn't cope being there.
I feel so left out as it is mostly it is a men's place me and my other boss Nina are the only girls there.
Anywho back to the story. My bosses just called. There oldest son is in hospital. They want me to come to work collect food bring it back to hospital and then come back home. My partner is not happy as he thinks it is not my responsibility and not my job. He thinks it should be the other drivers to do it or I take over Nina's job while she goes to the hospital to give food to her son. I know it is hard to run a pizza shop and deal with family life at the same time but I feel like I am doing these errands more and more often like that's all I am good for. I don't know what to do. I planning to quit soon because I want to move to Perth to be with my in laws but at the same time this is the longest job I have had for years and it will be sad to go. Don't get me wrong i have fabulous boss's they are like family to me and they do help me alot it just feels like so one sided at times.