how I saved my friend from depression

i'm new at this site and idk what to write here, so i'm gonna tell you a story about how i managed to save my friend from depression.
when i was in school, 9 grade as long as i remember, i had a good friend. we've been really good friends, and one time after school he took me behind our local shop, where my classmates were shopping after school, and telled me a story about how he managed to befriend with one of our she-classmates and she KISSED him. we were like 14-15 y.o., so i was really interested to listen that one, and cuz they were complete opposits, she was short and skinny, he was tall and a little chubby. 
after a long time of their friendship this moment happened, he even managed to remember the day: 11.24.23. he got his first kiss, and that one kiss clouded his mind with complete love to her. he wanted to do something more, maybe be in a relationship with her, but then there was an emotional coldness on her part, and he suffered cuz of it.
i was really sad seeing him in such a state of emotional swing that he experienced. after some time, he told me that he couldn't sleep normally, and he needed some kind of sedative in order to at least have some motivation to do something without thinking about her. you can say, "why did he told you that?", well, cuz my mom was a doctor, and she can get a prescription for a sedative easily, and my friend was morally positively prone to su1С1dal thoughts, which made the situation even more tense.
it was really hard to think about it. i walked home after school, sat on the bed and start to think. "how can i end this? maybe he really needs some sedative to even sleep normally?". no, that was a mistake. 
after some day's of reflection, i wrote him an ultimatum: "you take all your will into your fist and wrote her, and if she answers "no", then you forget about her like she was just a bad dream. there is no other way." 
and guess what? he did it. he texted her a big message, and she answered "i'm so sorry i was so cold to you. let's be friends again?", and that was helluva victory for him and me. for him cuz the friendship was restored, for me cuz, as an empath, it's nice to receive new emotions and help people.
after that, they used to actively communicate, but since i'm no longer in school, i don't know their exact relationship. perhaps they said "goodbye" to eachother forever.
good ending.
(that's all i've got to say, sorry for my bad english if i wrote something wrong <3)