Her first love with the MC failed and got in a relationship only because the man is persistent. In the real world, we can deduce that an overly aggressive suitor will very likely have bad intentions. She then got cheated on and never learned from it. In college, she got pregnant and the man tried to run away. For what I assume is her fear of being left alone, she didn't disagree with their parents' agreement to have them married to save face. Unsurprisingly, the coward turned out to be a cheater too and she divorced someone she should never have married in the first place. She shamelessly tried to get together with the MC using their past feelings instead of putting an effort in the present to make him like her. She proceeded to have more children with men who eventually left her instead of learning from experience. Her safest and best bet is to focus on her self and her child but I assume her loneliness got the best of her.