should i trust her ?

my gf liked a lot another guy before we were togheter, a guy from her past, she did a bj to him, but they didn’t get further because he didn’t want a relationship. ( she refused to have sex with him, because she wanted to keep her verginity for the right one)
She asked him to go to the bathroom of the school to kiss him.
But they never went there.
Months after she knew me.
At the same time she was talking to me, he begun to giving her some attention; she liked that and she hoped in him.
Than she kissed him while we were in the talking stage, one month before the promise was made.
She said to me that she wanted something serious.
She liked him more than she liked me, she wanted him.
But he didn’t liked her enought for a relationship.
So after some time we got togheter.
She chosed me because i was a good heart, and because the things with him didn’t work.
While we were togheter, she liked his attention, like compliment on social media.
But she ghosted him and never did a real conversation.
she never wrote him or serched him, but at the same time she liked his compliment on her.
the fact that She didn’t nothing to repair what she did,like blocking on ig him made me angry.
We were so much in love, we met each other parents, friends, and she bring me in her family, she made me feel like i was so so important to her, the man of her life.
After some time i discovered everything, all by myself,she lied because she was scared to lose me.
She did everything to get me back.
She let me take her verginity, because she said that i was the man of her life.
She let me threat her very bad, because i was angry.
But after all she still love me and want me back, even if everbody is against her.
She said to me that she is changed because now she love me and in the first month of our talking stage she didn’t know me enought and the love wasnt already there.
l think she did everything she could but i don’t know if she is really changed.
Should i accept her behaviur at the beginning and trust her ?