This thing that she cares about him seems like bullshit to me, let's put it that way. If I care about a person, I am happy to be together with him or her, I share my time with that person and take advantage of every opportunity to see myself with this person. I don't spend my time deceiving him/her by making excuses for not seeing us or whatever. It's amazing how in a year they both didn't think "but who can make it go on like this?".
Is Leora afraid of losing Paul? it is strange behavior for a person who is said to care a lot about another. It would also be easier for her to leave him, she would only need a phone call, a chat message, a carrier pigeon and so on. Yet it doesn't.
Maybe because deep down she doesn't trust LB, she KNOWS that he's not the right guy for her or her tastes. Yet, like a junkie who needs his stuff to get himself high, she still keeps dating a guy who actually doesn't give a shit.