Jealous of his gf

Jezika • Mama to #1 baby boy born 08/01/2021💙

So I, have a crush on this guy and the other day I found out he had a gf.. By sending me a picture of them kissing. Like he doesn't know I like him and I'm not gonna, tell him. It hurts so much like I feel physically sick and so heavy. Like my body feels so heavy and idk what to do. I wanna cry but I just can't and the only other thing I've found that can help me is cutting but I can't do that because if he finds out he gonna be disappointed in me and he doesn't to go my school but I see him on the train home and I just don't want to see him. Like I actually want to sit far away from him andbkofkhim on every social media I have him on and his phone number. Like it's so selfish and petty but that's just what I feel like doing. My friends said not to so I've just removed him from my private story on Sc and hid my day from him in insta and I'm ignoring him

Adivce would be great thank you xox I just don't know what to do at all

BTW I'm a 16 year old girl going into year 11 in 8days.. He's a 15 year old guy going in to 10th at another school