IIRC, the general approach to Yaakov marrying Rachel and Leah is that he intended to marry them both from the beginning, just in a different order.
Even if only Rachel was his soulmate, marrying another woman implies IMHO certain emotional obligations toward her mere beyond procreation and sustaining. In reality, not only that Yaakov never learns to love her, but their relations got so bad, even the Almighty testifies that Leah is simply hated and needs to be compensated.
Even if she initially conspired with her sister against Yaakov's plans, she always had benign intentions and eventually bore the majority of the tribes.
Why didn't Yaakov learn to love her?