My ex (son’s father) treats other single moms better?

So I’m a single mom, and raising my son alone while my sons father is too busy caring for other single moms. Whenever I ask him for help like to buy wipes cause my checks go so fast on bills etc he says things like “ what you can’t afford to buy wipes for our son, where’s your money go to to your parents?” And it’s hurtful I’m staying with my parents till I can save up enough to move out. But yet here’s my ex treating other baby mommas with respect, but me he treats like crap. How do I deal with this? Or tell him to treat me better?