A possible concise summary is:
The transcript is from a video of a blogger who tests the fidelity of her subscribers' boyfriends. She agrees to check a girl's boyfriend who communicates with his ex-girlfriend. She finds out that he still loves his ex and wants to get back with her. She decides to teach them a lesson by pretending to be another guy who likes the ex-girlfriend and asks her out. She also tells the boyfriend's current girlfriend about his cheating. She hopes that they will suffer from their own intrigues and learn not to play with other people's feelings.
Here are the key facts extracted from the text:
1. The text is a transcript of a video by a blogger who tests the fidelity of people's partners.
2. The blogger was asked by a girl to check her boyfriend, who communicates with his ex-girlfriend.
3. The blogger found out that the boyfriend and his ex-girlfriend still have feelings for each other and complain about their current partners.
4. The blogger decided to teach them a lesson by pretending to be a guy who likes the ex-girlfriend and writing to her and the boyfriend.
5. The blogger asked another guy to play along with his plan and pretend to be interested in the girl who asked for the test.
6. The blogger revealed his plan to the viewers and said that he will let the couple live with their own intrigues until they watch his video.