Louise is clingy and also mentally damaged. She never managed to have a proper relationship and it was shown how quickly she got furious about Jeremy (justified, the two had entirely different views about this relationship) and Lena (not justified).
Got the impression she is a bit of Robert-like in the regard that Eva goes out of her way to make Lena and Ian not wanting her. Its clear with Lena, she can't have strong feelings for her. With Ian its open for now. Him developing feelings towards her is rushed, otherwise he seems to play with her and Louise throws a tantrum if he ignores her just once, so this doesn't look promising for now. Even romancing Holly is less challenging.