Would you stay with a dead beat father?

My boyfriend doesn’t take care of his child by his ex gf the baby is 2 and he hasn’t seen the baby at all am I wrong for supporting him in his decision? The reason he isn’t involved is because he doesn’t like her mom. Her mom is always buying things for the baby without his permission and is always telling her daughter to not put him on child support because she will be the one who takes care of the baby especially since he hasn’t stepped up at all. He decided that he would let the mom do everything because he doesn’t want to. What would you do?