I just watched it. He basically bled out internally due to his longstanding alcoholism and last binge, and needed a massive blood transfusion. He's a 30-something dying alkie, and - here's the funny part - is still WAY more useful and capable than Fat Jen. He cleaned her apartment between bouts of near-death! She is clearly so THRILLED to have an actual may-un move in and pay attention to her and do all these little jobs that she's too lazy or too fat to do, like basic cleaning and tidying. She's also thtilled to have a boyfriend willing to play along on camera that she can brandish at her followers to show, yes, she is desirable and livin' her best lyfe!!!! so fuck u hatersz!!! that the fact that he's a dying addict clearly on his last legs, moving in with a Section 8 barely mobile fatty out of pure desperation. He is acting so chipper and happy it's clear he's in Mollify the New Mark mode. I imagine as he continues to drink and god knows living with Jen would drive a teetotaller to consider necking a half of vodka,, the relationship will start to disintegrate and he will show his less than stellar personality traits - as will she.
She's wilfully, stubbornly blind to how pathetic this set up is so I really don't care if he kills her, cooks her, and eats her (that would be ironic, eh). He probably won't do more than just use her for food and shelter and to fund his habit though, after which he'll either disappear or she'll finally throw a graphic meltdown after he throws up in her lap and shits the sheets, and cry him out of the place.