Please help

I just broke up with my first bf of ten months. He goes to my school.

His new girlfriend hates me. He used to be madly in love with me until i drove him into her arms because they were platonic friends until he broke up with me because we were different. He then realized that he had feelings for her but his feelings for me were extremely strong.

Theyre keeping their new relationship a secret and he asked me to keep the secret. I agreed.

They both go to my school. Im gonna see him everywhere. He said hes gonna not act cutesy with her when im around him and we have the same friendgroup.

When we broke up he told me he would try again if we were still single in a couple months. He said he would let me know if he met someone else. He got with the girl a month ago and he didnt even let me know and then told me he was paranoid that i wasnt gonna keep his secret and that if i told people his relationship with her would be ruined. Selfish much???

Hes a jerk. But i miss him and i still have feelings for him. And i go to the same school as him and i have the same classes as him and her. Idk what to do?? He keeps talking abt how she makes him so happy as if im not even here.. idk what to do and how to deal with it we r in the same friend group and the same school

What if i see him in the halls? PLEASE HELP! 💖