boy trouble

there’s this guy i like and we’re in the same group of friends and i was really embarrassed about telling anyone because 1) it would make it awkward since we are friends 2) he is a lot shorter/skinnier than me and i was scared of the comments they would make.. i eventually told them and one of my friends after a few months is now dating him. she knows i like him and she started dating him? i might sound like a bitch but she didn’t even ask me how that would make me feel?? surely you’d have the decency to at least tell me, but i had to find out from someone else a week after it started.. i feel so hurt and now all my friends are saying how cute they are together when they know that i like him and i feel really alone and like nobody really cares about how i feel. apparently my friend had liked him for a while and he’d liked her but i still find that a really shitty thing to do! she had never told me before that she was interested in him and it makes me really mad.. now whenever i’m at school i have to sit with them while watching them be all lovey and being a couple and every time i see them together my heart just sinks. i just want to know if i’m overreacting or being irrational.. i know i have to get over it but i really like this guy :( i’m really hurt and nobody seems to care. what’s worse is he doesn’t even know that i like him, and probably never will.. like it would be super embarrassing if he did know but there’s a part of me that just wants him to notice me for once.