I fucked up, guys....big time!!

My mom got me an easy stable babysitting job which she already told them I will do (without asking me.) But there's one catch! The older sister of the kid I will be watch will stay at the house the whole time. And guess who the older sister is! You guessed it!! MY EX! Last time we spoke to each other we yelled so loud that a stranger has to come and stop us. My relationships are coming back to haunt me! If I don't post later today then my ex killed me out of spite!