@Roky basically Inés is a reincarned woman in her third life (I think). The first life she had was perfect until her 16, when she had to marry the Imperator (the red haired guy, blonde's cousin). He was a trash man that had countless woman behind Inés back, meanwhile she was starving herself to be the perfect wife. After having four miscarriages and being abused by her husband, she decided killing herself in front of him. And now she woke up confused in her second life, when she was in her 16 again, just about to marry the Imperator again. She decides to do another way, and finds a man she loves and scape with him. But not long after her family found him and kill the poor man, and takes Inés and their baby (yes, she had a baby with him) to the family's mansion. After seeing the baby, they decide to eliminate him and hearing that Inés decides to take her life again. And now she is in her third life, this time different cause she reborn as a child and not a grow up woman. So she makes another plan for this life, choosing a random guy who is handsome to marry her, just to avoid all the tragedys she experienced in her previous life.
@Salada I also believe that she married him in hopes of like, being free, as she expected him to be with other women, which would give her the opportunity to be with the man from her second life. Just a theory tho.