My partner of 10 years is so lazy. Im so emotionally and physically exhausted. We have a 9 year old and a 2 year old. He has two children from a previous relationship, 12 and 15. He's always been lazy but since having my second child he seems to have gotten worse. I returned to work when my youngest was 9 months but quit when he was 11 months as he was not looking after him properly and leaving him to cry in his cot or leaving the other children to care for him. (I quit with immediate effect after i learned this) he works but on his days off doesnt help. I do all the school runs, parents evening, swimming lessons, cleaning, washing, cooking, putting children to bed, take the kids on days out (park, cinema, farm, bowling ect) all on mu own. I also take his other two children so i have four children with me somedays and were out 3-4 hours sometimes and he just sits there on his phone doing nothing the whole time (unless he's working) i get no thank you unless we argue then he says he appreciates me, but i feel like he's taking the piss out of me 
he never plays with our children. Im so exhausted, i just want to cry all the time. I asked him to do the dishes today (a bowl full) and he said no and caused an argument over nothing. I dont have alot of family, my mum lives 100 miles away so cant stay with her cus of childrens school and nursery. My friends all tell me to leave but it's hard when you have children. I just feel trapped. I just need to vent before i scream or lash out