I’m about to marry the perfect man, but his mother is a dealbreaker. Am I making a mistake?

I’ve been with my boyfriend for three years, and he is everything I could ask for—loving, caring, and just perfect. When he proposed, he mentioned one non-negotiable: his mother will live with us after marriage. At the time, I didn’t think much about it and said yes. But after meeting her, I realised it’s not going to work . She constantly puts me down, praises her son excessively, and makes it clear that I’m the lucky one to have him.

I tried discussing this with my fiancé, but he won’t budge—he refuses to leave her alone. I understand his responsibility as a son, but I also believe we deserve our own space as a couple. Now, I’m terrified of what life will be like after marriage. What if I regret this later? What if I can’t handle living with her? Am I overthinking, or is this a red flag? Has anyone been in a similar situation? How did you deal with it? Please help…

Edit-

I’m an introvert and it takes time for me to get comfortable with new people, so maybe I didn’t make the best first impression when we met. But that doesn’t give her the right to constantly point out that I don’t talk much. Now, imagine if she had found a daughter-in-law who was talkative and always responded actively—what would she have complained about then?

This incident happened twice…And he did defend me once.

When I say he’s perfect, I mean he genuinely cares about all the little things. He notices the smallest details about me, loves me deeply. He goes out of his way to do things that make me happy, and overall, he makes me feel truly loved. I’ve dated other men in the past, but I never felt this way about anyone. But I love this man — and that’s the whole situation