I live in the UK, your mother was my father. It is expensive in the Philippines BUT NOT THAT expensive. My dad wanted to keep appearances and show off his daughter was in the UK earning a lot of money. But I knew what he was doing and would keep saying No to him. He even said to me, "where are you spending your money that you won't give anything to me?" I just told him that I was saving. Because I was.
OP, the Filipino culture especially our parents time is toxic. They grew up at a time that where what other people think about you mattered. But it doesn't. I know you love your mom but you have to think of your future.