Love is sticky and confusing and painful. And that’s when it works. “Conversations With Friends,” based on the 2017 debut novel of Sally Rooney, her second TV adaptation after the hit “Normal People,” premiered Sunday on Hulu with the messy love story of four people: college student Frances (Alison Oliver), her best friend Bobbi (Sasha Lane), essayist Melissa (Jemima Kirke), who gravitates toward the friends at a spoken word poetry night, and Melissa’s actor husband Nick (Joe Alwyn). Frances once loved Bobbi, but now they are just friends, or maybe friends just for now. Nick loved Melissa enou…