context: Sherman 'Tank' Turner (Dane Cook) is a help line operator and a ladies man with a hobby: If a guy loses a girl and wants her back, he gets in touch with Tank and pays him to take the girl on a bad date. Throughout the evening Tank inevitably behaves in the most moronic fashion causing the girl to realize that her ex was not really such a bad guy after all and get back to their ex.
  He shares an apartment with his step cousin Dustin (Jason Biggs) who has fallen for his work colleague Alexis (Kate Hudson). Dustin takes Alexis on a date and confesses his love but she insists they remain friends. After the date Dustin explains his situation to Tank who volunteers his services as a good friend (instead of having to pay for his services as usual). Dustin initially turns him down, not wanting Tank to be close to Alexis, but the next day sees Alexis flirting with another co-worker and begs Tank to take Alexis out. He accepts.
  Tank bumps into Alexis and they arrange to go out. He behaves badly all night but Alexis is too drunk to care. When he drops her off she expects him to come in but he resists the temptation out of loyalty to Dustin. Alexis calls Dustin but when they meet she explains that her date with Tank has motivated her to see other men. Dustin sends Alexis roses and an apology poem in Tank's name. Alexis calls Tank at work and berates him for leaving early the previous night.
  Tank goes to see Alexis and they end up having casual sex on a regular basis while Dustin begins a series of desperate attempts to stay friends with her after all. Tank's feelings for Alexis start to grow but after consulting with his father (Alec Baldwin), he has doubts that he is deserving of a serious relationship with her. While attending the wedding of Alexis' sister Rachel (Diora Baird), he realizes that she is one of his previous bad dates. The groom, Josh (Taran Killam), asks Tank to keep quiet about his use of his services. After overhearing Alexis telling Rachel that she has fallen for him, Tank's guilt causes him to sabotage their relationship and call Dustin to apologize to him.
  Dustin arrives at the wedding reception and reveals Tank's schemes to Alexis. Tank points out his clients, including the groom, and is punched and thrown out. Alexis, distraught from the fact that Tank used her, and that Dustin played to cheaply win her, never wants to see either of them again. Later, while talking with Dustin and his father, Tank realizes that he loves Alexis and they encourage him to reconcile with her. He finds her and jogs with her for a few miles, in the attempt to make amends, but Alexis is unmoved.
  Three months later, Tank is on a date when Alexis sees him and spontaneously decides to sabotage the date by embarrassing him. She walks up to him and throws wine in his face, ruining his date. Then continues to try embarrass him by stating to the whole room that he left her pregnant. He soon catches on to her "joke" and they then continue to throw insults at each other (some of which shadow previous insults they threw at each other at their second meeting), each trying to best each other in a "play argument" of insults and bantering. After which they reconcile with a kiss. The film ends suggesting their relationship is back on. As the film's titles roll up, it is shown/suggested that Dustin and Alexis' roommate Ami (Lizzy Caplan) hook up (or at very least have a sexual encounter if not actually a relationship). It's left up to the audience to decide.
question: who is feelings for Alexis?
answer: Tank