May anybody help me with my crush?

Hello It's a quite long, stupid and detailed story, will be really thankful if anyone actually reads it, (I hate myself for being a dumb, emotional teen and letting all this happen. Wanted to share it and some advice).
It all started about 5 months ago, even if It feels like yesterday. I just started school and it was all fun and games, meeting with my friends, talking about our summer and suddenly I was about to crash into some taller guy. It happened really fast, he was staring at his phone and probably didn't notice me, but I noticed his beautiful eyes. Then I thought to myself "What a gorgeous guy! Why haven't I seen him before? That may be the last time I see him probably." Hah, you bet! I saw him about 10 minutes later outside. He really was gorgeous! Pale, blonde mid length hair, cool beard, fit but not too ripped, basically everything I like. I couldn't get his image out of my head for the rest of the day, and didn't understand why. I mean, I have never crushed on strangers before. Decided that it will go away with time, few weeks passed and well, it didn't. So as the dumb teen I am, I stopped denying and started lowkey looking for him when going out in the big breaks. I see him almost every day. At the beginning all this was really fun, the butterflies and all, but now after few months is kinda emotionally draining.
I think he may know about me, because one day my best friend came to visit me and we saw him. I started pulling her like crazy and whispering "Look at him, look at him" as he passed us. The hall was empty, except for my PE teacher (who happened to be also his) who saw me and kinda grinned. I immediately got paranoid, that he's gonna tell my crush, but my friend calmed me and said, that he is a grown man and won't do that. But he's also young and very cool with his students (i like him a lot too and wont even be mad if he told) and I can totally imagine him saying something like "Btw (crush name), I think you got a fan or something, haha." And my fear came true, I think. After the next PE class I had I saw my crush speaking with the teacher. The teacher looked at me, smiled and looked back at him, then they both looked at me smiling. Quite suspicious.
Turned out two of my not so close, but still very trustworthy friends know him. I told one of them and he said he'll help me and told me a bit about my crush - turns out he's a really nice, shy guy with good grades and weird sense of humor . He also texted him and casually asked if he haves a girlfriend. Crush responded with "Nah man, i don't really want one rn" Which is cool and understandable, before I was thinking exactly the same. I actually want to become friends with him first.
Also about 2 weeks later i see him with some girl kissing his cheek. Usually I will be happy for him, but it seemed kinda off. He had a serious look on his face and looked me straight into the eyes. I considered this as "See, i'm taken, give up already". I don't know, maybe I'm just paranoid at this point. Thankfully, that week I got other stuff to worry about and that didn't affect me too much. To calm me my guy friend told me, that this seemed more like a friendly kiss and he seemed annoyed, like he annoys me, but i didn't want to think about that right at te monent. The next day I saw him again, she was also somewhere around him. As I came closer he tried to grab her, not taking his eyes of me. Again, suspicious, but I was too tired to care at this point. Lately he's alone again, but I don't have much time to go out in the break because exams.
So I need advice. Shall i ask my friends to introduce me to him? And also, Valentines day is coming. I was thinking of sending him anonymously a valentine with something jokingly-passively-agressive like " Hey I think I like you and can't stop thinking about you, that's distracting me a lot, so I can't wait for you to graduate." Is it a good idea?

PS: Thanks to anyone who took their time to read all this and eventually responds. <3 And excuse my english, is not my first language for sure