My(M24) ex Girlfriend(F21) wants to get back together with me after a 6 month of break. What Should I Do?

TL;DR My cheater Girlfriend wants me back.

So in 2019, we got together. She proposed me. I said Yes. She was very caring person, she loved me from all of her heart.

Her mother (F48) had been continuously interfering our relationship. Asking her weird questions like 'do you think he loves you?', he will leave you, you two are not good enough for each other. Also She's been talking bad about me behind my back to her. (In front she acted like she support us.) PS ( I didn't knew this at all untill June 2023)

In May 2022, that Girl cheated on me. She told me that I was being to much Ovservent, possesive etc etc. I thought it was like my fault. I did my all efforts to get her back. Eventually In July 2022 , We got back together.

In October 2022, she told me out of nowhere, she's not interested in me. I was like heh? 🤣 Her mom convinced her i think and we got together. (In between days, we were together just like a ideal couple do.)

Suddenly in May 2023, she told me she's not interested in me at all. She really don't want to be with me. I told her okay. And I got away from her. But her mother told me she's trying to get her back. Don't lose hope. I said okay.

After 3 Months, September 2023, on my birthday, she told me she wants to give one another try. (I think her mother pressurised her). So we got together. But same thing Happened in January 2024. She don't want me anymore. I left her that day.

Now the real twist. In February 2024 , My Ex's female friend told me that she's been talking to a guy. She's been video calling him, texting him, seeing him in person. Soon my ex came to know that that new guy has girlfriend and they are committed. I think she lost interest in him. She told everyone that he's just friend. (I think she liked him. Cause this happened before. Similar thing happened before 3-4 times. She tells everyone that he's just a friend but she don't talk to them like a normal friend do.)

So when she realised that the new guy has GF, Recently she called me from her sister's mobile and told me that she's been thinking about me lately. She's going to focus on her career then she wants me to be her future partner. She told me that guy was just a friend ,nothing more. I am not convinced by it. I'm not sure what to do. Please Advice.

(PS : She left me for around 4-5 times by saying she wants to make her career first. She don't want anyone. But also doing these things like talking to guys, posting Instagram etc etc that a well career focused person would never do it.) It's June 2024. She's been contacting me constantly. Telling me that she wants us to be together. I don't know what to do? Please Advice.

(PS: I love her but I think I don't deserve this. Treating me as a second option.)