After Love explained Joe, how she did everything she can in order for their relationship, Joe is irritated, disappointed, scared and ashamed. He hates Love at first and really wants to kill her(he didn't really want to kill Beck and Candace). But after Joe learns that he is going to be a father, he starts loving Love instantly(some might find dumb) because her being pregnant and him being father is one of his most important imaginations and he wants to do everything for it just like he wanted to do everything for Beck. The thing is he doesn't love Love anymore, he saw her true colours, he saw how they are the same which means Love is not what he imagined her to be(think about your dreams about your crush, she will disappoint you in real life compared to your dreams). Joe falls in love with someone without even knowing, without even actually looking at someone because he needed this love for all of his life. Joe doesn't love Love anymore because he didn't fall in love with a complex, guilty woman, he found a beautiful girl and fantasized about her. And the last scene shows how much Joe hates himself. Joe hates how similar he is to Love and doesn't like her because he doesn't like himself, he hates himself so much that he falls for the neighbour without even seeing her face. Some say they are disappointed and you must be disappointed this is what the show is aiming for. Joe is not someone to root for,Joe wants to meet someone perfect without even loving himself and after learning that they are not perfect, he loses his interest. He wants to be in control and he wants to kill Love when she takes control. He gets really nervous after he doesn't remember what he had done at night because he wants to be at control of everything and this is why he fails every time. The audience might have thought that Joe had changed after Love but how he met Love was still his choice, his stalking. And if you control everything, even a small discrepancy will make you lose your love.