Little by little more will be learned about past events as the game goes on, notably during a future chapter with a home coming, where Myriam will return for to Texas for a full chapter.
But to put things simply, here's a quick view at her psychology as she grew up (don't look if you want to keep the surprise for later):
Myriam has lost her mother very young and had a loving father but always very busy with work, she also have a younger brother menially deficient. All this making her in a way growing up with some emotional problems: like a deep need for affection and a daddy complex; a tendency to always try to be the good girl so she doesn't disappoint people around her; an over maternal need to spoil as she played the role of the mother for her little brother. Add to this the fact she develop a strong curiosity about sex as she grew up without much guidance on this part and you had an easy starting point for a sweet curious and naive girl to be charmed and manipulated by the first asshole who found the opportunity, which is exactly what happened.
Some more spoilers for past background (again, don't look if you want to keep the surprise for later):
Anthony was actually the big brother of a friend of Myriam and already worked for her father. Anthony being an opportunistic asshole jumped on the opportunity to advance his career by charming the boss' daughter. Being the big brother of a friend gave him the opening he needed to charm the naive young girl with a daddy complex and a thing for older men.
Here you go, that should clear things up. ^^
Yep, sorry, I'll have to get to it one day. ^^
But meanwhile, if you have questions, don't hesitate to ask, if I can I'll answer.
Yes, as
absalon1977 answered, it's still building up and will only start/happen during chapter 3, which is nearly there, just 2 to 3 updates max to conclude my chapter 2.
In the mean time here some spoilers about the potential romances/sexual encounters with lesbian theme:
Nubia, the dominatrix, a strong cultured woman who will have a dominating relationship with Myriam; Lucy, the fighter, another strong willed character but with a very soft side when it comes to love; Kimberley, the secretary, a sweet girl manipulated by Anthony that will discover her interest for women as she meet Myriam. The three will be the main romance, but after that Myriam will be able to have some sexual exploration with some other, like Katherine, her daughter, or Jennifer her daughter's friend. There will be also a complicated relation with her cousin Evelyn.
I understand that, but for now, she's not awaken enough to it to slip up about it and I want to brought it right.