I have an Anxious Attachment to a friend (Please help)

In the classroom, I have a friend with which I spent some time. We have similar interests, similar hobbies and he is so kind and a good person. Sadly I build around him unhealthy attachment.

I would do anything for him, I'm even helping him when he does not ask for help. I want to make him happy, laugh and i really care about him (I care about him much more, than he cares about me) I don't see that exactly as a problem, but a problem is made due to this.
Another friend with the same similar hobbies from the same classroom started to talk with that friend which I care about, and this made me jealous. This made me so jealous, that I feel depressed, anxious, and even more jealous, that I even now don't like that friend which is talking with him, due to that he is spending time with him. Every few hours I go to social media, discord, games, etc... to see if they are both online at the same time and ask myself: are they spending time with each other? I feel so pleased when they are not together, but when I see that they are spending time with each other, without me I feel so bad that I even feel so depressed and sometimes I even cry.

I don't know what to do, it's destroying me from the inside, I feel like I'm left behind.
I need to resolve this as quickly as possible because I can't stand it anymore.
Please help <3