S4·E13 Nina Loves Alex

Alex is strangely rejecting the advances of a cute, bubbly, young African American cab driver named Nina. Alex is growing more and more annoyed until he decides to invite Nina over to his apartment to talk to her and try to explain why she shouldn't be so interested in him. Although he succeeds with a fatherly talk where he comes off very dull, they kiss goodnight. After the kiss, Nina is convinced there's no spark between them after all, while Alex seems to change his tune also, but it's too late.