Can i ask you a question..really need some one mature and wise?

here the thing.. both me and my bf drink.. i about 3 sometime 4 times a week.. him everyday..holidays coming up.. and his family..and children live in the next state.. we split the rent..he pays for the comcast bill.. i pay the lights..and we split the car ins.. i pay for the food. he buys the liquor..but child support takes up 1/4 of his check so on the second week before we get paid i end up getting the booze and cigs.. here the thing.he promise his children..age 7.8 .13 to be home for thanksgiving.. he suppose to be saving for gas..but i know he will not have the money..he spent 50 tonight on weed and 20 on booze..last night 20 on booze and lotto.. not to mention 30 at taco bell for him self.i got my own child to buy for xmas.. and if i need something for her he is no help..so should i put a little aside to go out of town..or should i just make him do it ..as he is the one who told them we would be there..i hate to disappoint the children..but last yr when I took my mom shopping for xmas gifts for my girls (her grand kids) he was complaining about supporting everyone and not getting his xbox360 so i took out a cc and got it for him..and now i am filing chapter 7 and he is no help and paying the lawyer..and yes he help charge up all the other cards..any way i got the xbox because he made me feel bad..we had a bank account together even though i made more money..now it is a seperate account..I just know that when he spends all his money he is going to make me feel bad and i will want to help..but how do i tell my self..to say no..xmas is coming up and as i said i have my own children to think about.,.right now before the holidays.. i am buying her birthdays presents because her birthday is right before christmas..and going to start on xmas soon..I like to give her more than one present..he how ever will only give his 1 .. execept for last yr when he had use of my credit cards.how do you handle some one who throws a pity party to make you feel bad?