High school student Alex Truelove has been friends with Claire for a while. After discovering her mother is being tested for cancer, she and Alex share a moment where Alex comforts her. They kiss and then begin dating. After Alex is embarrassed in front of his friends about still being a virgin, he and Claire make a plan to book a hotel room and have sex for the first time.
At a party, Alex meets Elliot, an openly gay teenager. Alex's continued interactions with Elliot, who has an obvious crush on Alex, lead him to question his sexuality. Alex confesses to his friend Dell that he believes he might be bisexual, but Dell says that he is just nervous about losing his virginity to Claire and his anxiety has led him to a false conclusion. One day while hanging out in Elliot's bedroom, Alex kisses him, but immediately regrets it and storms out.
During the evening of their first time having sex, Alex blurts out to Claire that he has feelings for someone else and she throws him out. Later, still avoiding Elliot, Alex goes to a party where he drunkenly sleeps with a girl he only just met. Claire catches them, and Alex chases her into the night. He falls into a swimming pool where traumatic memories from his childhood come back to him. Claire finds him by the pool, where he confesses to her that he is gay. They decide to go to prom together anyway.
At prom, Claire reveals she has invited Elliot to be Alex's actual date, knowing that neither of them would actually make the move without her "passing the baton". While Alex is initially concerned about everyone watching him, he decides that his affection for Elliot is stronger and kisses him.
The story ends with Alex creating a video with Claire detailing his coming out.
On Rotten Tomatoes, the film has an approval rating of 81% based on 26 reviews, and an average rating of 6.1/10. The website's critical consensus reads, "Alex Strangelove offers a refreshingly insightful – and fittingly adult – take on teen sexuality enlivened by smart humor and a fearlessly progressive approach."[10] On Metacritic, the film has a weighted average score of 62 out of 100, based on 10 critics, indicating "generally favorable reviews".[11]