Is she faking happiness? What should I do? I’m overeating?

I had a situationship for 12 years going on. I never officially dated. I invited him to church and I have a best friend for 8years. I told her that It would be super hard for me if she started liking him. (He’s 30 and she’s 23) she said that it was to gross to think about it, in June of this year, but on August I found out that they were texting and planning to go out. It broke me, she was also very sad and said that she was very sorry. That she didn’t want him, she actually felt the same vibe of her ex (toxic ) that she doesn’t know how she ended up like that. I forgave her and two months later I felt her off. We took a break but I received a call of an other friend saying that she went out with him. I called her and we broke up the relationship, she’s now dating him officially.. was she sincere about that she didn’t want him? Now everyone telling me That she looks happier than ever. I don’t understand why she is now with him. When she said that she knew that he wasn’t for her… also the time that I forgave her she stopped talking to him and he was already talking with other girls.( he is like that) and she know how he is. But she kept talking to him. And now I’m alone

Is she faking happiness? What should I do? I’m overeating?
Post Opinion