Despite cutting me off, my mother continues to accept my financial support

I'm 32(F - single) living somewhere around the world. My mother (55 - single mom) is residing in Ph wilth my brother (18) and son (8). For context, my son is receiving a monthly allowance from his dad and I'm also providing a monthly allowance for my mom and brother as well.

2 years ago, my son's father and I separated because I had an affair with a married man. My mother was furious when she knew about it and made it clear that she doesn't approve of my relationship. At the same time, my partner has also separted from his wife.

At the present, I told my mother that I was going to take my son to live with me. Thus she knew that my partner and I have moved in together. She blocked me from all communications that I had with her and with the family. Morever, she told my son everything and even spread it to the whole famiy. Now, my son will not talk to me and even blocked me.

I am not asking for her to accept my relationship, however as an adult I deserve to have my own choices. I'm very upset and I feel used. I'm financially supporting her, and she's cutting me off. I have no choice because of my son. I understand my son is hurt and confused, but I hope he can understand that my actions are not a true reflection of my love for him.