my life going down hill i broke up with my gurl that i had four years?

she was married to another guy and then i fell in love wit her, we got together and i helped her to be a better person she had a lot of issue. thought out the four years we have been struggling , fast forward to the begin of this year i had a great paying job and i had us above water then 6 month later i lost my job , thing got really stressful we dont know wats goin to happen the next day and she always a act like b*tch for no reason and some times she would do thing that would get me mad and she would act i shouldn't b mad , so i kept telling her that we was goin to break up if this keep up and yesterday we did break up so many thing goin on my life my dad is in the hospital and my job is not that good and i have so many bills, i lost my car and I feel like i love her and she can be a better person and i believe i probably going to lose her to another guy ???

do ya think the break up is good or i messed up ??