After Charlie and Mia bump in to each other at a cafe, Mia asks Charlie to help her out with some music she has been working on. Because of his recent engagement Charlie says he shouldn't, but after Chelsea says he can, he agrees to help her out. However, Charlie discovers he has feelings for Mia and Chelsea and his body reacts to this conundrum by becoming constipated. Charlie shows up at the recording studio unsure of what to do, but ultimately realizes that he truly loves Chelsea and tells Mia that it's over for good. Meanwhile, Alan is back together with his ex-secretary/girlfriend, Melissa, and asks Charlie if she can move in with them. Charlie says no, but none the less Melissa seems to have moved in.