Stupid selfish bf

Last night I really wanted cookie dough ice cream. Bf would have to drive literally a block to get it. He complained then said ok then proceeds to ask me for money for said ice cream!!! I said forget it because I just finished telling him that after bills and rent, I have about $400 for groceries, gas and anything else for the next month. (My cat died unexpectedly so I'm paying off a huge vet bill and my car repairs before baby gets here...I also have 2 kids I have to feed and clothe so $400 won't go very far) anyhow this morning, I catch him counting a wad of money to the sum of $800 ...I was pissed! Apparently he needs me to pay for a $5 tub of ice cream! Ugh