“Summer Loving” is all about relationships, both new and old, but not all work out as planned. Frank (William H. Macy) pursues Dottie (Molly Price), a woman awaiting for a heart transplant and doesn’t have anyone to inherit her home and pension should she die; Ian (Cameron Monaghan) resumes his relationship with Mickey (Noel Fisher) now that Mickey’s out of jail; and Lip (Jeremy Allen White) comes to a realization about his relationship with Karen (Laura Wiggins) now that she’s seeing Jody (Zach McGowan).